A journalist takes pictures of the electronic boards displaying stock prices in the reception hall in Athens stock exchange, Greece August 3, 2015.Greece's stock market plunged nearly 23 percent on Monday when it opened after a five-week shutdown brought on by fears the country was about to be dumped from the euro zone. REUTERS/Yiannis Kourtoglou

EUROZONE-GREECE/STOCKMARKET - Charts Greece's Athex Composite index and its one day-change since 1989. (SIN08)

A statue of former Greek Prime Minister Charilaos Trikoupis is seen in front of the old parliament building in Athens, Greece August 3, 2015. Trikoupis in 1893 made his famous comment, "Unfortunately, we are bankrupt". REUTERS/Yiannis Kourtoglou

A pedestrian walks by the old parliament and a statue of former Greek Prime Minister Charilaos Trikoupis in Athens, Greece August 3, 2015. Trikoupis in 1893 made his famous comment, "Unfortunately, we are bankrupt". REUTERS/Yiannis Kourtoglou

A statue of former Greek Prime Minister Charilaos Trikoupis is seen in front of the old parliament building in Athens, Greece August 3, 2015. Trikoupis in 1893 made his famous comment, "Unfortunately, we are bankrupt". REUTERS/Yiannis Kourtoglou

An employee talks on the phone in Athens Stock Exchange, Greece August 3, 2015. Greece's stock market plunged nearly 23 percent on Monday when it opened after a five-week shutdown brought on by fears the country was about to be dumped from the euro zone. REUTERS/Yiannis Kourtoglou

An employee looks on at electronic board displaying stock prices at the entrance of the Athens Stock Exchange, Greece, August 3, 2015. Greece's stock market plunged nearly 23 percent on Monday when it opened after a five-week shutdown brought on by fears the country was about to be dumped from the euro zone. REUTERS/Yiannis Kourtoglou

An employee hands over the phone at the entrance of the Athens Stock Exchange, Greece, August 3, 2015. Greece's stock market plunged nearly 23 percent on Monday when it opened after a five-week shutdown brought on by fears the country was about to be dumped from the euro zone. REUTERS/Yiannis Kourtoglou

A man walks inside the Athens Stock Exchange in Greece August 3, 2015. Greece's stock market plunged nearly 23 percent on Monday when it opened after a five-week shutdown brought on by fears the country was about to be dumped from the euro zone. REUTERS/Yiannis Kourtoglou TPX IMAGES OF THE DAY

A man stands near an electronic board displaying stock prices during a trading session at Karachi Stock Exchange February 6, 2014. Pakistan's Karachi Stock Exchange is investigating whether staff profited from years of unauthorised access to real time trading data in a market that has rocketed more than 450 percent since 2009. To match Exclusive PAKISTAN-STOCKMARKET/ REUTERS/Akhtar Soomro (PAKISTAN - Tags: BUSINESS)

Men pass a monitor displaying stock prices during a trading session at Karachi Stock Exchange February 6, 2014. Pakistan's Karachi Stock Exchange is investigating whether staff profited from years of unauthorised access to real time trading data in a market that has rocketed more than 450 percent since 2009. To match Exclusive PAKISTAN-STOCKMARKET/ REUTERS/Akhtar Soomro (PAKISTAN - Tags: BUSINESS)

A man monitors stock prices during a trading session in the halls of Karachi Stock Exchange February 6, 2014. Pakistan's Karachi Stock Exchange is investigating whether staff profited from years of unauthorised access to real time trading data in a market that has rocketed more than 450 percent since 2009. To match Exclusive PAKISTAN-STOCKMARKET/ REUTERS/Akhtar Soomro (PAKISTAN - Tags: BUSINESS)

An electronic board displaying stock prices and an index graph is seen during a trading session at the Karachi Stock Exchange February 6, 2014. Pakistan's Karachi Stock Exchange is investigating whether staff profited from years of unauthorised access to real time trading data in a market that has rocketed more than 450 percent since 2009. To match Exclusive PAKISTAN-STOCKMARKET/ REUTERS/Akhtar Soomro (PAKISTAN - Tags: BUSINESS EMPLOYMENT CRIME LAW)

A man sits on a sofa while monitoring prices during trading session at the Karachi Stock Exchange February 6, 2014. Pakistan's Karachi Stock Exchange is investigating whether staff profited from years of unauthorised access to real time trading data in a market that has rocketed more than 450 percent since 2009. To match Exclusive PAKISTAN-STOCKMARKET/ REUTERS/Akhtar Soomro (PAKISTAN - Tags: BUSINESS)

Ashraf Tiwana, a British-educated Pakistani lawyer, leaves the Supreme Court building in Islamabad February 28, 2013. Picture taken on February 28, 2013. To match Insight PAKISTAN-STOCKMARKET/ REUTERS/Mian Khursheed (PAKISTAN - Tags: BUSINESS)

Aqeel Karim Dhedhi, Chairman of AKD Securities Ltd, speaks during an interview with Reuters at his office in Karachi January 31, 2013. Picture taken January 31, 2013. To match Insight PAKISTAN-STOCKMARKET/ REUTERS/Akhtar Soomro (PAKISTAN - Tags: BUSINESS)

Ashraf Tiwana, a British-educated Pakistani lawyer, leaves the Supreme Court building in Islamabad February 28, 2013. Picture taken on February 28, 2013. To match Insight PAKISTAN-STOCKMARKET/ REUTERS/Mian Khursheed (PAKISTAN - Tags: BUSINESS)

Aqeel Karim Dhedhi, Chairman of AKD Securities Ltd, speaks during an interview with Reuters at his office in Karachi January 31, 2013. Picture taken January 31, 2013. To match Insight PAKISTAN-STOCKMARKET/ REUTERS/Akhtar Soomro (PAKISTAN - Tags: BUSINESS)

A trader speaks on a mobile phone as she works on the floor of the Libya Stock Exchange in the capital Tripoli March 15, 2012. Libya's Stock Exchange resumed trading on Thursday after more than 12 months out of action on Thursday, signalling that the country is getting back to business after last year's conflict ousted leader Muammar Gaddafi. REUTERS/Anis Mili (LIBYA - Tags: POLITICS BUSINESS)

Traders talk in front of a board displaying stock prices on the floor of the Libya Stock Exchange in the capital Tripoli March 15, 2012. Libya's Stock Exchange resumed trading on Thursday after more than 12 months out of action on Thursday, signalling that the country is getting back to business after last year's conflict ousted leader Muammar Gaddafi. REUTERS/Anis Mili (LIBYA - Tags: POLITICS BUSINESS)

A businessman (2nd R) shakes hands with a trader (R) at the Libya Stock Exchange in the capital Tripoli March 15, 2012. Libya's Stock Exchange resumed trading on Thursday after more than 12 months out of action on Thursday, signalling that the country is getting back to business after last year's conflict ousted leader Muammar Gaddafi. REUTERS/Anis Mili (LIBYA - Tags: POLITICS BUSINESS)

Officials cheer after ringing a bell to announce the start of trading on the floor of the Libya Stock Exchange in the capital Tripoli March 15, 2012. Libya's Stock Exchange resumed trading on Thursday after more than 12 months out of action on Thursday, signalling that the country is getting back to business after last year's conflict ousted leader Muammar Gaddafi. REUTERS/Anis Mili (LIBYA - Tags: BUSINESS POLITICS)

A board displaying stock prices is pictured on the floor of the Libya Stock Exchange in the capital Tripoli March 15, 2012. Libya's Stock Exchange resumed trading on Thursday after more than 12 months out of action on Thursday, signalling that the country is getting back to business after last year's conflict ousted leader Muammar Gaddafi. REUTERS/Anis Mili (LIBYA - Tags: POLITICS BUSINESS)

Officials cheer after ringing a bell to announce the start of trading on the floor of the Libya Stock Exchange in the capital Tripoli March 15, 2012. Libya's Stock Exchange resumed trading on Thursday after more than 12 months out of action on Thursday, signalling that the country is getting back to business after last year's conflict ousted leader Muammar Gaddafi. REUTERS/Anis Mili (LIBYA - Tags: BUSINESS POLITICS TPX IMAGES OF THE DAY)

People gather during a roadshow event at the Phnom Penh Water Supply Authority (PPWSA) February 29, 2012. After several false starts, Cambodia's stock exchange may finally open its doors in April if a campaign to sell stock in the capital's water utility draws enough investors. The Cambodia Securities Exchange (CSX) was supposed to start trading in September 2009 but the launch has been repeatedly delayed. The Phnom Penh Water Supply Authority (PPWSA) began a book-building exercise on Wednesday and its director general, Ek Sonn Chan, dubbed the "Clean Water Hero", said he would be happy to meet potential investors individually to persuade them to buy. REUTERS/Samrang Pring (CAMBODIA - Tags: BUSINESS SOCIETY)

A Water Supply Authority officer digs to install a water pipe in Phnom Penh February 29, 2012. After several false starts, Cambodia's stock exchange may finally open its doors in April if a campaign to sell stock in the capital's water utility draws enough investors. The Cambodia Securities Exchange (CSX) was supposed to start trading in September 2009 but the launch has been repeatedly delayed. The Phnom Penh Water Supply Authority (PPWSA) began a book-building exercise on Wednesday and its director general, Ek Sonn Chan, dubbed the "Clean Water Hero", said he would be happy to meet potential investors individually to persuade them to buy. REUTERS/Samrang Pring (CAMBODIA - Tags: SOCIETY BUSINESS)

A man walks past in the West Africa Stock Exchange office based in Abidjan January 4, 2012. The West Africa regional bourse is eyeing at least four listings in 2012 and is seeking to improve liquidity by lowering the minimum price for a share, the head of the exchange said. To match Interview IVORYCOAST-STOCKMARKET/ REUTERS/Thierry Gouegnon (IVORY COAST - Tags: BUSINESS)

Jean-Paul Gillet, General Director of the West Africa Stock Exchange, speaks during an interview with Reuters in Abidjan January 4, 2012. The West Africa regional bourse is eyeing at least four listings in 2012 and is seeking to improve liquidity by lowering the minimum price for a share, the head of the exchange said. To match Interview IVORYCOAST-STOCKMARKET/ REUTERS/Thierry Gouegnon (IVORY COAST - Tags: BUSINESS)

Jean-Paul Gillet, General Director of the West Africa Stock Exchange, speaks during an interview with Reuters in Abidjan January 4, 2012. The West Africa regional bourse is eyeing at least four listings in 2012 and is seeking to improve liquidity by lowering the minimum price for a share, the head of the exchange said. To match Interview IVORYCOAST-STOCKMARKET/ REUTERS/Thierry Gouegnon (IVORY COAST - Tags: BUSINESS)

Jean-Paul Gillet, General Director of the West Africa Stock Exchange, speaks during an interview with Reuters in Abidjan January 4, 2012. The West Africa regional bourse is eyeing at least four listings in 2012 and is seeking to improve liquidity by lowering the minimum price for a share, the head of the exchange said. To match Interview IVORYCOAST-STOCKMARKET/ REUTERS/Thierry Gouegnon (IVORY COAST - Tags: BUSINESS HEADSHOT)

Head of Nigeria's Securities and Exchange Commission, Arunma Otteh, speaks at a news conference announcing the sack of former council members of the Stock Exchange in the commercial capital of Lagos August 6, 2010. Nigeria's Securities and Exchange Commission (SEC) appointed accountancy firm KPMG to audit the stock exchange and expressed confidence on August 10, 2010, a new chief executive for the troubled bourse could be found quickly. Picture taken August 6, 2010. REUTERS/Akintunde Akinleye (NIGERIA - Tags: BUSINESS SOCIETY)

A view of the Nigerian Stock Exchange (NSE) on Kakawa street in the commercial capital of Lagos August 6, 2010. Nigeria's Securities and Exchange Commission (SEC) appointed accountancy firm KPMG to audit the stock exchange and expressed confidence on August 10, 2010, a new chief executive for the troubled bourse could be found quickly. The SEC last week removed Nigerian Stock Exchange (NSE) Director-General Ndi Okereke-Onyuike and suspended its president, Aliko Dangote, Nigeria's richest man and one of its best-known tycoons, over governance concerns. Picture taken August 6, 2010.
REUTERS/Akintunde Akinleye (NIGERIA - Tags: BUSINESS SOCIETY)

Files are placed on the floor of a trading hall of the Royal Bhutan stock exchange in Thimphu November 19, 2009. Traders seeking a break from volatile global markets may want to head to Bhutan's bourse, where stocks are traded on just four computers -- when they have not crashed -- only twice a week. Picture taken November 19, 2009. To match Reuters Life! BHUTAN-STOCKMARKET/ REUTERS/Adnan Abidi (BHUTAN)

A view of the trading hall of the Royal Bhutan stock exchange in Thimphu November 19, 2009. Traders seeking a break from volatile global markets may want to head to Bhutan's bourse, where stocks are traded on just four computers -- when they have not crashed -- only twice a week. Picture taken November 19, 2009. To match Reuters Life! BHUTAN-STOCKMARKET/ REUTERS/Adnan Abidi (BHUTAN POLITICS SOCIETY BUSINESS)

Files lie on the floor of the trading hall of the Royal Bhutan stock exchange in Thimphu November 19, 2009. Traders seeking a break from volatile global markets may want to head to Bhutan's bourse, where stocks are traded on just four computers -- when they have not crashed -- only twice a week. Picture taken November 19, 2009. To match Reuters Life! BHUTAN-STOCKMARKET/ REUTERS/Adnan Abidi (BHUTAN POLITICS SOCIETY BUSINESS)

A worker stands inside the hall of the Royal Bhutan Securities Exchange in Thimphu November 19, 2009. Traders seeking a break from volatile global markets may want to head to Bhutan's bourse, where stocks are traded on just four computers -- when they have not crashed -- only twice a week. Picture taken November 19, 2009. To match Reuters Life! BHUTAN-STOCKMARKET/ REUTERS/Adnan Abidi (BHUTAN POLITICS SOCIETY BUSINESS)

A broker works inside a trading hall of Royal Bhutan stock exchange in Thimphu November 19, 2009. Traders seeking a break from volatile global markets may want to head to Bhutan's bourse, where stocks are traded on just four computers -- when they have not crashed -- only twice a week. Picture taken November 19, 2009. To match Reuters Life! BHUTAN-STOCKMARKET/ REUTERS/Adnan Abidi (BHUTAN POLITICS SOCIETY BUSINESS)

A broker works inside a trading hall of the Royal Bhutan stock exchange in Thimphu November 19, 2009. Traders seeking a break from volatile global markets may want to head to Bhutan's bourse, where stocks are traded on just four computers -- when they have not crashed -- only twice a week. Picture taken November 19, 2009. To match Reuters Life! BHUTAN-STOCKMARKET/ REUTERS/Adnan Abidi (BHUTAN POLITICS SOCIETY BUSINESS)

A broker walks inside a hall of the Royal Bhutan stock exchange in Thimphu November 19, 2009. Traders seeking a break from volatile global markets may want to head to Bhutan's bourse, where stocks are traded on just four computers -- when they have not crashed -- only twice a week. Picture taken November 19, 2009. REUTERS/Adnan Abidi (BHUTAN POLITICS SOCIETY BUSINESS)

Department of Homeland Security Secretary Janet Napolitano (L) tours the floor of the New York Stock Exchange with vice president of NYSE Euronext, Lawrence Leibowitz (C), December 4, 2009. REUTERS/Brendan McDermid (UNITED STATES BUSINESS POLITICS)

Department of Homeland Security Secretary Janet Napolitano (2nd R) talks with specialist trader Elizabeth Rose during a tour of the floor at the New York Stock Exchange, December 4, 2009. REUTERS/Brendan McDermid (UNITED STATES BUSINESS POLITICS)

Department of Homeland Security Secretary Janet Napolitano (L) tours the floor of the New York Stock Exchange with the Vice President of NYSE Euronext Lawrence Leibowitz December 4, 2009. REUTERS/Brendan McDermid (UNITED STATES BUSINESS MILITARY)

A resident drives past the marshland where Cambodia hopes to turn the page on decades of upheaval by opening a stock exchange in Phnom Penh September 25, 2009. The idea of a Cambodian stockmarket has been floated since the 1990s but has struggled for traction in a country known for a culture of political impunity, chronic poverty and a history of violence, including the Khmer Rouge "Killing Fields". Picture taken September 25, 2009. To match feature CAMBODIA-EXCHANGE/ REUTERS/Chor Sokunthea (CAMBODIA BUSINESS)

A resident drives past the marshland where Cambodia hopes to turn the page on decades of upheaval by opening a stock exchange in Phnom Penh September 25, 2009. The idea of a Cambodian stockmarket has been floated since the 1990s but has struggled for traction in a country known for a culture of political impunity, chronic poverty and a history of violence, including the Khmer Rouge "Killing Fields". Picture taken September 25, 2009. To match feature CAMBODIA-EXCHANGE/ REUTERS/Chor Sokunthea (CAMBODIA BUSINESS)

A stockbroker plays a computer game during a trading session inside the trading hall at the Karachi Stock Exchange, October 8, 2008. While Pakistan's economy tanks and its rupee strikes record lows, share dealers on the Karachi Stock Exchange have been reduced to watching television, playing video games and thinking about new careers. To match feature PAKISTAN-STOCKMARKET/ REUTERS/Athar Hussain (PAKISTAN)

A stockbroker plays a computer game during a trading session inside the trading hall at the Karachi Stock Exchange, October 8, 2008. While Pakistan's economy tanks and its rupee strikes record lows, share dealers on the Karachi Stock Exchange have been reduced to watching television, playing video games and thinking about new careers. To match feature PAKISTAN-STOCKMARKET/ REUTERS/Athar Hussain (PAKISTAN)

A stockbroker takes a nap during a trading session inside the trading hall at the Karachi Stock Exchange, October 8, 2008. While Pakistan's economy tanks and its rupee strikes record lows, share dealers on the Karachi Stock Exchange have been reduced to watching television, playing video games and thinking about new careers. To match feature PAKISTAN-STOCKMARKET/ REUTERS/Athar Hussain (PAKISTAN)

A stockbroker works inside the trading hall at the Karachi Stock Exchange, October 8, 2008. While Pakistan's economy tanks and its rupee strikes record lows, share dealers on the Karachi Stock Exchange have been reduced to watching television, playing video games and thinking about new careers. To match feature PAKISTAN-STOCKMARKET/ REUTERS/Athar Hussain (PAKISTAN)

A stockbroker rests during a trading session inside the trading hall at the Karachi Stock Exchange, October 8, 2008. While Pakistan's economy tanks and its rupee strikes record lows, share dealers on the Karachi Stock Exchange have been reduced to watching television, playing video games and thinking about new careers. To match feature PAKISTAN-STOCKMARKET/ REUTERS/Athar Hussain (PAKISTAN)

Portugal's President Anibal Cavaco Silva rings the opening bell of the New York Stock Exchange with NYSE-Euronext CEO, Duncan Niederauer, in New York September 25, 2008. REUTERS/Brendan McDermid (UNITED STATES)

Portugal's President Anibal Cavaco Silva rings the opening bell of the New York Stock Exchange with NYSE-Euronext CEO, Duncan Niederauer, in New York September 25, 2008. REUTERS/Brendan McDermid (UNITED STATES)

Mexico's President Felipe Calderon (C) tours the floor of the New York Stock Exchange with his wife Margarita Zavala (R) and the CEO of NYSE-Euronext Duncan Niederauer, September 24, 2008. REUTERS/Brendan McDermid (UNITED STATES)

A trader uses a mobile phone during trading at the Iraq Stock Exchange in Baghdad November 25, 2007. At the Iraq Stock Exchange in Baghdad, prices have yet to fully recover from heavy losses they took after almost two years of sectarian bloodshed made trips to the bourse a risky venture. Taha Ahmed Abdul-Salam, the exchange's chief executive, said he hoped things would improve soon thanks to an electronic system set for launch early in 2008 to speed up transactions and make it easier for foreigners to trade Iraqi shares. Picture taken November 25, 2007. To match feature IRAQ/STOCKMARKET REUTERS/Ceerwan Aziz (IRAQ)

Traders work at the Iraq Stock Exchange in Baghdad November 25, 2007. At the Iraq Stock Exchange in Baghdad, prices have yet to fully recover from heavy losses they took after almost two years of sectarian bloodshed made trips to the bourse a risky venture. Taha Ahmed Abdul-Salam, the exchange's chief executive, said he hoped things would improve soon thanks to an electronic system set for launch early in 2008 to speed up transactions and make it easier for foreigners to trade Iraqi shares. Picture taken November 25, 2007. To match feature IRAQ/STOCKMARKET REUTERS/Ceerwan Aziz (IRAQ)

An elderly man uses a pair of binoculars to view the stock prices at the Iraq Stock Exchange in Baghdad November 25, 2007. At the Iraq Stock Exchange in Baghdad, prices have yet to fully recover from heavy losses they took after almost two years of sectarian bloodshed made trips to the bourse a risky venture. Taha Ahmed Abdul-Salam, the exchange's chief executive, said he hoped things would improve soon thanks to an electronic system set for launch early in 2008 to speed up transactions and make it easier for foreigners to trade Iraqi shares. Picture taken November 25, 2007. To match feature IRAQ/STOCKMARKET REUTERS/Ceerwan Aziz (IRAQ)

An elderly man talks to a fellow investor using a pair of binoculars to view the stock prices at the Iraq Stock Exchange in Baghdad November 25, 2007. At the Iraq Stock Exchange in Baghdad, prices have yet to fully recover from heavy losses they took after almost two years of sectarian bloodshed made trips to the bourse a risky venture. Taha Ahmed Abdul-Salam, the exchange's chief executive, said he hoped things would improve soon thanks to an electronic system set for launch early in 2008 to speed up transactions and make it easier for foreigners to trade Iraqi shares. Picture taken November 25, 2007. To match feature IRAQ/STOCKMARKET REUTERS/Ceerwan Aziz (IRAQ)

An investor busies himself with two phone calls as he monitors the stock market at a securities firm in Hong Kong November 2, 2007. The Hang Seng Index plunged 1,024.54 points, amounting to 3.25%, to close at 30,468.34. REUTERS/Herbert Tsang (CHINA)

A woman gestures in front of an electronic board at a stock exchange in Hefei, east China's Anhui province May 14, 2007. China's State Council, or cabinet, has sought suggestions from top economists on ways to control the rapid rise of the country's share prices, sources said on Monday. REUTERS/Jianan Yu (CHINA)

Rosneft Vice President for Finance Peter O'Brien speaks at Renaissance Capital's 10th Annual Investors Conference in Moscow June 19, 2006. Recent stockmarket volatility will not alter the timetable for the initial public offering of Russian state oil firm Rosneft, the firm's Vice President for Finance Peter O'Brien told an investment conference on Monday. REUTERS/Viktor Korotayev (RUSSIA)

Rosneft Vice President for Finance Peter O'Brien speaks at Renaissance Capital's 10th Annual Investors Conference in Moscow June 19, 2006. Recent stockmarket volatility will not alter the timetable for the initial public offering of Russian state oil firm Rosneft, the firm's Vice President for Finance Peter O'Brien told an investment conference on Monday. REUTERS/Viktor Korotayev (RUSSIA)