Hands are seen on a keyboard in front of a displayed cyber code in this picture illustration taken October 4, 2018. REUTERS/Dado Ruvic/Illutration

Traders work at their desks in front of the German share price index, DAX board, at the stock exchange in Frankfurt, Germany, December 22, 2016. REUTERS/Staff/Remote

Traders work at their desks in front of the German share price index, DAX board, at the stock exchange in Frankfurt, Germany, December 21, 2016. REUTERS/Staff/Remote

A recorded 3D kung fu staff form is seen on a computer screen, as part of the Hong Kong Martial Arts Living Archive at City University in Hong Kong, China December 6, 2016. Picture taken December 6, 2016. REUTERS/Bobby Yip

Traders work at their desks in front of the German share price index, DAX board, at the stock exchange in Frankfurt, Germany, December 20, 2016. REUTERS/Staff/Remote

Traders work at their desks in front of the German share price index, DAX board, at the stock exchange in Frankfurt, Germany, December 15, 2016. REUTERS/Staff/Remote

Soccer Football - Club America v Real Madrid - FIFA Club World Cup Semi Final - International Stadium Yokohama - 15/12/16 General view of a part of the video refereeing system before the match Reuters / Kim Kyung-Hoon Livepic

Soccer Football - Club America v Real Madrid - FIFA Club World Cup Semi Final - International Stadium Yokohama - 15/12/16 General view of a part of the video refereeing system before the match Reuters / Kim Kyung-Hoon Livepic

Soccer Football - Club America v Real Madrid - FIFA Club World Cup Semi Final - International Stadium Yokohama - 15/12/16 General view of a part of the video refereeing system before the match Reuters / Kim Kyung-Hoon Livepic

Soccer Football - Club America v Real Madrid - FIFA Club World Cup Semi Final - International Stadium Yokohama - 15/12/16 General view of a part of the video refereeing system before the match Reuters / Kim Kyung-Hoon Livepic

Soccer Football - Club America v Real Madrid - FIFA Club World Cup Semi Final - International Stadium Yokohama - 15/12/16 General view of a part of the video refereeing system before the match Reuters / Kim Kyung-Hoon Livepic

Traders work at their desks in front of the German share price index, DAX board, at the stock exchange in Frankfurt, Germany, December 14, 2016. REUTERS/Staff/Remote

Host Arnold Schwarzenegger walks on stage to participate in a panel for "The New Celebrity Apprentice" in Universal City, California, December 9, 2016. REUTERS/Danny Moloshok

Host Arnold Schwarzenegger walks on stage to participate in a panel for "The New Celebrity Apprentice" in Universal City, California, December 9, 2016. REUTERS/Danny Moloshok TPX IMAGES OF THE DAY

Britain's Prince Harry takes part in a charity trading day at ICAP with Edward Bird on the Interest Rate Swaps Desk in support of his charity Sentebale, in London, December 7, 2016. REUTERS/Geoff Pugh/Pool

Britain's Prince Harry takes part in a charity trading day at ICAP with Edward Bird on the Interest Rate Swaps Desk in support of his charity Sentebale, in London, December 7, 2016. REUTERS/Geoff Pugh/Pool

Britain's Prince Harry takes part in a charity trading day at ICAP with Kate Arnold and Samantha Bennett on the EBS Direct Desk in support of his charity Sentebale, in London, December 7, 2016. REUTERS/Geoff Pugh/Pool

Britain's Prince Harry takes part in a charity trading day at ICAP with Kate Arnold and Samantha Bennett on the EBS Direct Desk in support of his charity Sentebale, in London, December 7, 2016. REUTERS/Geoff Pugh/Pool

Britain's Prince Harry takes part in a charity trading day at ICAP with Edward Bird on the Interest Rate Swaps Desk in support of his charity Sentebale, in London, December 7, 2016. REUTERS/Geoff Pugh/Pool

Traders work at their desks in front of the German share price index, DAX board, at the stock exchange in Frankfurt, Germany, December 5, 2016. REUTERS/Staff/Remote

Russian President Vladimir Putin is seen on a screen during his annual state of the nation address at the Kremlin in Moscow, Russia, December 1, 2016. REUTERS/Maxim Shemetov

Russian President Vladimir Putin is seen on a screen during his annual state of the nation address at the Kremlin in Moscow, Russia, December 1, 2016. REUTERS/Maxim Shemetov

Traders work at their desks in front of the German share price index, DAX board, at the stock exchange in Frankfurt, Germany, November 29, 2016. REUTERS/Staff/Remote

Italy's Prime Minister Matteo Renzi (R) speaks as he is flanked by Italy's Finance Minister Pier Carlo Padoan (L) during a news conference at the Chigi Palace in Rome November 28, 2016. REUTERS/Tony Gentile

Italy's Prime Minister Matteo Renzi speaks during a news conference at the Chigi Palace in Rome November 28, 2016 . REUTERS/Tony Gentile

French President Francois Hollande (R) flanked by French Labor Minister Myriam El Khomri (2ndR) look on a computer screen as an online teacher speaks, during a visit to Open Classrooms, in Paris, France, November 24, 2016. REUTERS/Francois Mori/Pool

French President Francois Hollande (R) flanked by French Labor Minister Myriam El Khomri (2ndR) look on a computer screen as an online teacher speaks, during a visit to Open Classrooms, in Paris, France, November 24, 2016. REUTERS/Francois Mori/Pool

Traders work at their desks in front of the German share price index, DAX board, at the stock exchange in Frankfurt, Germany, November 24, 2016. REUTERS/Staff/Remote

Traders work at their desks in front of the German share price index, DAX board, at the stock exchange in Frankfurt, Germany, November 16, 2016. REUTERS/Staff/Remote

Traders work at their desks in front of the German share price index, DAX board, at the stock exchange in Frankfurt, Germany, November 10, 2016. REUTERS/Staff/Remote

Traders work at their desks in front of the German share price index, DAX board, at the stock exchange in Frankfurt, Germany, November 9, 2016. REUTERS/Staff/Remote

Traders work at their desks in front of the German share price index, DAX board, at the stock exchange in Frankfurt, Germany, November 9, 2016. REUTERS/Staff/Remote

Traders work at their desks in front of the German share price index, DAX board, at the stock exchange in Frankfurt, Germany, November 9, 2016. REUTERS/Staff/Remote

Traders work at their desks in front of the German share price index, DAX board, at the stock exchange in Frankfurt, Germany, early November 9, 2016. REUTERS/Staff/Remote

Production monitors and switchboards are illuminated in the press pen before Melania Trump, wife to the Republican presidential nominee, holds an event at Main Line Sports in Berwyn, Pennsylvania, U.S. November 3, 2016. REUTERS/Mark Makela

U.S. Democratic presidential nominee Hillary Clinton's speech is broadcast in a room adjacent to her campaign rally in Sanford, Florida, U.S. November 1, 2016. REUTERS/Brian Snyder

Visitors play a video game "Made in France" at the Paris Games Week, a trade fair for video games in Paris, France, October 26, 2016. REUTERS/Benoit Tessier

Visitors play the video game Final Fantasy XV at the Paris Games Week, a trade fair for video games in Paris, France, October 26, 2016. REUTERS/Benoit Tessier

Visitors play a video game at the Paris Games Week, a trade fair for video games in Paris, France, October 26, 2016. REUTERS/Benoit Tessier

Visitors play Final Fantasy XIV : Heavensward at the Paris Games Week, a trade fair for video games in Paris, France, October 26, 2016. REUTERS/Benoit Tessier

A visitor plays Paragon, a video game published by Epic Games at the Paris Games Week, a trade fair for video games in Paris, France, October 26, 2016. REUTERS/Benoit Tessier

Visitors play games on PlayStation 4 (PS4) at the Paris Games Week, a trade fair for video games in Paris, France, October 26, 2016. REUTERS/Benoit Tessier

Visitors play Final Fantasy XV, a video game published by Square-Enix at the Paris Games Week, a trade fair for video games in Paris, France, October 26, 2016. REUTERS/Benoit Tessier

Panos Panay, Corporate Vice President for Surface Computing demonstrates the new Microsoft Surface Studio computer at a live event in the Manhattan borough of New York City, U.S.,October 26, 2016. REUTERS/Lucas Jackson

Panos Panay, Corporate Vice President for Surface Computing demonstrates the new Microsoft Surface Studio computer at a live event in the Manhattan borough of New York City, U.S.,October 26, 2016. REUTERS/Lucas Jackson

Panos Panay, Corporate Vice President for Surface Computing holds the new Microsoft Surface Studio computer at a live event in the Manhattan borough of New York City, October 26, 2016. REUTERS/Lucas Jackson TPX IMAGES OF THE DAY

Panos Panay, Corporate Vice President for Surface Computing demonstrates the new Microsoft Surface Studio computer at a live event in the Manhattan borough of New York City, October 26, 2016. REUTERS/Lucas Jackson

Panos Panay, Corporate Vice President for Surface Computing demonstrates the new Microsoft Surface Studio computer at a live event in the Manhattan borough of New York City, October 26, 2016. REUTERS/Lucas Jackson

Panos Panay, Corporate Vice President for Surface Computing demonstrates the new Microsoft Surface Studio computer at a live event in the Manhattan borough of New York City, October 26, 2016. REUTERS/Lucas Jackson

Panos Panay, Corporate Vice President for Surface Computing demonstrates the new Microsoft Surface Studio computer at a live event in the Manhattan borough of New York City, October 26, 2016. REUTERS/Lucas Jackson

Panos Panay, Corporate Vice President for Surface Computing demonstrates the new Microsoft Surface Studio computer at a live event in the Manhattan borough of New York City, October 26, 2016. REUTERS/Lucas Jackson

Panos Panay, Corporate Vice President for Surface Computing holds the new Microsoft Surface Studio computer at a live event in the Manhattan borough of New York City, October 26, 2016. REUTERS/Lucas Jackson

Panos Panay, Corporate Vice President for Surface Computing holds the new Microsoft Surface Studio computer at a live event in the Manhattan borough of New York City, October 26, 2016. REUTERS/Lucas Jackson

Panos Panay, Corporate Vice President for Surface Computing holds the new Microsoft Surface Studio computer at a live event in the Manhattan borough of New York City, October 26, 2016. REUTERS/Lucas Jackson

Traders work at their desks in front of the German share price index, DAX board, at the stock exchange in Frankfurt, Germany, October 19, 2016. REUTERS/Staff/Remote

Traders work at their desks in front of the German share price index, DAX board, at the stock exchange in Frankfurt, Germany, October 6, 2016. REUTERS/Staff/Remote

Traders work at their desks in front of the German share price index, DAX board, at the stock exchange in Frankfurt, Germany, October 4, 2016. REUTERS/Staff/Remote

A screen displays the speech of Britain's Chancellor of the Exchequer Philip Hammond during the Conservative Party conference in Birmingham, Britain October 3, 2016. REUTERS/Toby Melville

Traders work at their desks in front of the German share price index, DAX board, at the stock exchange in Frankfurt, Germany, September 27, 2016. REUTERS/Staff/Remote

French President Francois Hollande is seen on a computer screen in a booth overlooking the General Assembly Hall as he speaks during the 71st United Nations General Assembly in Manhattan, New York, U.S. September 20, 2016. REUTERS/Carlo Allegri