Outgoing Swiss Finance Minister Eveline Widmer-Schlumpf gives her last speech during the ministerial elections in the Swiss Parliament during the winter session in Bern, Switzerland December 9, 2015. REUTERS/Ruben Sprich 

Outgoing Swiss Finance Minister Eveline Widmer-Schlumpf gives her last speech during the ministerial elections in the Swiss Parliament during the winter session in Bern, Switzerland December 9, 2015. REUTERS/Ruben Sprich 

Swiss Finance Minister Eveline Widmer-Schlumpf gestures during a news conference in Bern, Switzerland October 28, 2015. Widmer Schlumpf announced that she will not seek reelection on December 9, 2015. REUTERS/Ruben Sprich 

Swiss Finance Minister Eveline Widmer-Schlumpf leaves after a news conference in Bern, Switzerland October 28, 2015. Widmer Schlumpf announced that she will not seek reelection on December 9, 2015. REUTERS/Ruben Sprich 

Swiss Finance Minister Eveline Widmer-Schlumpf attends a news conference in Bern, Switzerland October 28, 2015. Widmer Schlumpf announced that she will not seek reelection on December 9, 2015. REUTERS/Ruben Sprich 

Swiss Finance Minister Eveline Widmer-Schlumpf (C) arrives for a news conference with spokepersons Roland Meier (L) and Brigitt Hauser-Suess in Bern, Switzerland October 28, 2015. Widmer Schlumpf announced that she will not seek reelection on December 9, 2015. REUTERS/Ruben Sprich 

Swiss Finance Minister Eveline Widmer-Schlumpf gestures during a news conference in Bern, Switzerland October 28, 2015. Widmer Schlumpf announced that she will not seek reelection on December 9, 2015. REUTERS/Ruben Sprich 

Swiss Finance Minister Eveline Widmer-Schlumpf attends a news conference in Bern, Switzerland October 28, 2015. Widmer Schlumpf announced that she will not seek reelection on December 9, 2015. REUTERS/Ruben Sprich 

Swiss Finance Minister Eveline Widmer-Schlumpf attends a news conference in Bern, Switzerland October 28, 2015. Widmer Schlumpf announced that she will not seek reelection on December 9, 2015. REUTERS/Ruben Sprich TPX IMAGES OF THE DAY

Swiss Finance Minister Eveline Widmer-Schlumpf (L) and Switzerland's Vice Chancellor of the Federal Council Andre Simonazzi arrive for a news conference in Bern, Switzerland October 28, 2015. Widmer Schlumpf announced that she will not seek reelection on December 9, 2015. REUTERS/Ruben Sprich 

Swiss Finance Minister Eveline Widmer-Schlumpf (L) and Switzerland's Vice Chancellor of the Federal Council Andre Simonazzi arrive for a news conference in Bern, Switzerland October 28, 2015. Widmer Schlumpf announced that she will not seek reelection on December 9, 2015. REUTERS/Ruben Sprich 

Swiss Finance Minister Eveline Widmer-Schlumpf arrives for a news conference in Bern, Switzerland October 28, 2015. Widmer Schlumpf announced that she will not seek reelection on December 9, 2015. REUTERS/Ruben Sprich 

Swiss Finance Minister Eveline Widmer-Schlumpf arrives for a news conference in Bern, Switzerland October 28, 2015. Widmer Schlumpf announced that she will not seek reelection on December 9, 2015. REUTERS/Ruben Sprich 

Swiss Finance Minister Eveline Widmer-Schlumpf attends a news conference after the weekly meeting of the Federal Council in Bern, Switzerland October 21, 2015. The Swiss National Bank on Wednesday welcomed the Swiss government's decision on new 'too big to fail' regulations. The Federal Council adopted the parameters for amendments to the current too-big-to-fail provisions. REUTERS/Ruben Sprich 

Swiss Finance Minister Eveline Widmer-Schlumpf speaks to media during a news conference after the weekly meeting of the Federal Council in Bern, Switzerland October 21, 2015. The Swiss National Bank on Wednesday welcomed the Swiss government's decision on new 'too big to fail' regulations. The Federal Council adopted the parameters for amendments to the current too-big-to-fail provisions. REUTERS/Ruben Sprich 

Swiss Finance Minister Eveline Widmer-Schlumpf speaks to media during a news conference after the weekly meeting of the Federal Council in Bern, Switzerland October 21, 2015. The Swiss National Bank on Wednesday welcomed the Swiss government's decision on new 'too big to fail' regulations. The Federal Council adopted the parameters for amendments to the current too-big-to-fail provisions. REUTERS/Ruben Sprich 

(L-R) Swiss National Bank (SNB) Chairman Thomas Jordan, Swiss Financial Market Supervisory Authority (FINMA) Director Mark Branson and Swiss Finance Minister Eveline Widmer-Schlumpf arrive for a news conference after the weekly meeting of the Federal Council in Bern, Switzerland October 21, 2015. The Swiss National Bank on Wednesday welcomed the Swiss government's decision on new 'too big to fail' regulations. The Federal Council adopted the parameters for amendments to the current too-big-to-fail provisions. REUTERS/Ruben Sprich 

Swiss Finance Minister Eveline Widmer-Schlumpf arrives for a news conference after the weekly meeting of the Federal Council in Bern, Switzerland October 21, 2015. The Swiss National Bank on Wednesday welcomed the Swiss government's decision on new 'too big to fail' regulations. The Federal Council adopted the parameters for amendments to the current too-big-to-fail provisions. REUTERS/Ruben Sprich 

Swiss National Bank (SNB) Chairman Thomas Jordan (L-R), Swiss Finance Minister Eveline Widmer-Schlumpf and Swiss Financial Market Supervisory Authority (FINMA) Director Mark Branson arrive for a news conference after the weekly meeting of the Federal Council in Bern, Switzerland October 21, 2015. The Swiss National Bank on Wednesday welcomed the Swiss government's decision on new 'too big to fail' regulations. The Federal Council adopted the parameters for amendments to the current too-big-to-fail provisions. REUTERS/Ruben Sprich TPX IMAGES OF THE DAY

Swiss Finance Minister Eveline Widmer-Schlumpf speaks to media during a news conference after the weekly meeting of the Federal Council in Bern, Switzerland August 26, 2015. The Federal Council rejects the popular initiative "Yes to the protection of privacy". REUTERS/Ruben Sprich 

Swiss Finance Minister Eveline Widmer-Schlumpf speaks to media during a news conference after the weekly meeting of the Federal Council in Bern, Switzerland August 26, 2015. The Federal Council rejects the popular initiative "Yes to the protection of privacy". REUTERS/Ruben Sprich 

Swiss Finance Minister Eveline Widmer-Schlumpf arrives for a news conference after the weekly meeting of the Federal Council in Bern, Switzerland August 26, 2015. The Federal Council rejects the popular initiative "Yes to the protection of privacy". REUTERS/Ruben Sprich 

Swiss Finance Minister Eveline Widmer-Schlumpf sorts her papers in a news conference after the weekly meeting of the Federal Council in Bern, Switzerland August 26, 2015. The Federal Council rejects the popular initiative "Yes to the protection of privacy". REUTERS/Ruben Sprich 

Swiss Finance Minister Eveline Widmer-Schlumpf speaks to media during a news conference after the weekly meeting of the Federal Council in Bern, Switzerland July 1, 2015. The Swiss government on Wednesday named securities lawyer and former consultant Thomas Bauer as new chairman for financial regulator FINMA. REUTERS/Ruben Sprich

Swiss Finance Minister Eveline Widmer-Schlumpf speaks to media during a news conference after the weekly meeting of the Federal Council in Bern, Switzerland July 1, 2015. The Swiss government on Wednesday named securities lawyer and former consultant Thomas Bauer as new chairman for financial regulator FINMA. REUTERS/Ruben Sprich

Swiss Finance Minister Eveline Widmer-Schlumpf speaks to media during a news conference after the weekly meeting of the Federal Council in Bern, Switzerland July 1, 2015. The Swiss government on Wednesday named securities lawyer and former consultant Thomas Bauer as new chairman for financial regulator FINMA. REUTERS/Ruben Sprich

New chairman for financial regulator FINMA Thomas Bauer (L) listens to Swiss Finance Minister Eveline Widmer-Schlumpf during a news conference after the weekly meeting of the Federal Council in Bern, Switzerland July 1, 2015. The Swiss government on Wednesday named securities lawyer and former consultant Bauer as new chairman for financial regulator FINMA. REUTERS/Ruben Sprich

Swiss Finance Minister Eveline Widmer-Schlumpf sorts her documents before a news conference after the weekly meeting of the Federal Council in Bern, Switzerland July 1, 2015. The Swiss government on Wednesday named securities lawyer and former consultant Thomas Bauer as new chairman for financial regulator FINMA. REUTERS/Ruben Sprich

Swiss Finance Minister Eveline Widmer-Schlumpf speaks during the Swiss International Finance Forum in Bern, Switzerland June 29, 2015. "It's a little bit difficult for us to understand that a referendum like this one can be organised and carried out in one week," Widmer-Schlumpf told an audience in Bern on Monday when asked about the Greek referendum. "It takes a bit longer to do in Switzerland," Widmer-Schlumpf said to laughter from the crowd. Picture taken June 29, 2015. REUTERS/Ruben Sprich 

Swiss National Bank (SNB) Chairman Thomas Jordan (R) talks to Swiss Finance Minister Eveline Widmer-Schlumpf (L) and UBS Chairman Axel Weber during the Swiss International Finance Forum in Bern, Switzerland June 29, 2015. REUTERS/Ruben Sprich 

(L-R) Swiss Ministers of Environment, Transport, Energy and Communications Doris Leuthard, Finance Minister Eveline Widmer-Schlumpf, Economy Minister Johann Schneider-Ammann and Interior Minister Alain Berset attend a news conference on the referendum on a new Federal law for TV and radio tax in Bern June 14, 2015. REUTERS/Ruben Sprich

Swiss Finance Minister Eveline Widmer-Schlumpf speaks during a news conference after the weekly meeting of the Federal Council in Bern, Switzerland June 5, 2015. REUTERS/Ruben Sprich 

Swiss Finance Minister Eveline Widmer-Schlumpf speaks during a news conference after the weekly meeting of the Federal Council in Bern, Switzerland June 5, 2015. REUTERS/Ruben Sprich 

Swiss Finance Minister Eveline Widmer-Schlumpf arrives for a news conference after the weekly meeting of the Federal Council in Bern, Switzerland June 5, 2015. REUTERS/Ruben Sprich 

Swiss Finance Minister Eveline Widmer-Schlumpf (R) and Swiss Interior Minister Alain Berset leave a news conference after yesterday's weekly meeting of the Federal Council on the strategy in family politics in Bern, Switzerland May 21, 2015. REUTERS/Ruben Sprich

Swiss Finance Minister Eveline Widmer-Schlumpf (L) speaks to media next to Swiss Interior Minister Alain Berset during a news conference after yesterday's weekly meeting of the Federal Council on the strategy in family politics in Bern, Switzerland May 21, 2015. REUTERS/Ruben Sprich

Swiss Finance Minister Eveline Widmer-Schlumpf (L) speaks to media next to Swiss Interior Minister Alain Berset during a news conference after yesterday's weekly meeting of the Federal Council on the strategy in family politics in Bern, Switzerland May 21, 2015. REUTERS/Ruben Sprich

Swiss Interior Minister Alain Berset (R) speaks to media next to Swiss Finance Minister Eveline Widmer-Schlumpf during a news conference after yesterday's weekly meeting of the Federal Council on the strategy in family politics in Bern, Switzerland May 21, 2015. REUTERS/Ruben Sprich

Swiss Finance Minister Eveline Widmer-Schlumpf speaks to media during a news conference on a new legacy tax initiative in Bern April 21, 2015. Switzerland will vote in a referendum regarding the introduction of the tax on June 14, 2015 . REUTERS/Ruben Sprich

Swiss Finance Minister Eveline Widmer-Schlumpf speaks to media during a news conference on a new legacy tax initiative in Bern April 21, 2015. Switzerland will vote in a referendum regarding the introduction of the tax on June 14, 2015 . REUTERS/Ruben Sprich 

Swiss Finance Minister Eveline Widmer-Schlumpf speaks to media during a news conference on a new legacy tax initiative in Bern April 21, 2015. Switzerland will vote in a referendum regarding the introduction of the tax on June 14, 2015 . REUTERS/Ruben Sprich 

(Front L-R) Switzerland's Finance Minister Eveline Widmer-Schlumpf, Saudi Arabia's Finance Minister Abdulaziz Al-Assaf, Germany's Finance Minister Wolfgang Schaeuble, People's Bank of China Governor Zhou Xiaochuan and Singapore's Finance Minister Tharman Shanmugaratnam gather for a group photo of the International Monetary and Financial Committee (IMFC) governors, during the IMF and World Bank's 2015 Annual Spring Meetings, in Washington, April 18, 2015. REUTERS/Mike Theiler

Swiss Finance Minister Eveline Widmer-Schlumpf speaks to the media during a news conference after Switzerland voted against two tax initiatives in Bern March 8, 2015. REUTERS/Ruben Sprich (SWITZERLAND - Tags: POLITICS BUSINESS HEADSHOT) 

Swiss Finance Minister Eveline Widmer-Schlumpf speaks to the media during a news conference after Switzerland voted against two tax initiatives in Bern March 8, 2015. REUTERS/Ruben Sprich (SWITZERLAND - Tags: POLITICS BUSINESS HEADSHOT) 

Swiss Finance Minister Eveline Widmer-Schlumpf speaks to the media during a news conference after Switzerland voted against two tax initiatives in Bern March 8, 2015. REUTERS/Ruben Sprich (SWITZERLAND - Tags: POLITICS BUSINESS HEADSHOT) 

Swiss Finance Minister Eveline Widmer-Schlumpf speaks to the media during a news conference after Switzerland voted against two tax initiatives in Bern March 8, 2015. REUTERS/Ruben Sprich (SWITZERLAND - Tags: POLITICS BUSINESS HEADSHOT) 

Swiss Finance Minister Eveline Widmer-Schlumpf arrives in front of Italy's Finance Minister Pier Carlo Padoan for a meeting to sign an agreement on sharing tax information, part of a drive to combat tax evasion, in Milan, February 23, 2015. REUTERS/Stefano Rellandini (ITALY - Tags: BUSINESS POLITICS) 

Swiss Finance Minister Eveline Widmer-Schlumpf (L) shakes hands with Italy's Finance Minister Pier Carlo Padoan during a meeting to sign an agreement on sharing tax information, part of a drive to combat tax evasion, in Milan, February 23, 2015. REUTERS/Stefano Rellandini (ITALY - Tags: BUSINESS) 

Swiss Finance Minister Eveline Widmer-Schlumpf (2L), Swiss President and Justice Minister Simonetta Sommaruga (2R) and heads of parties and factions attend the von Wattenwyl talks in Bern February 13, 2015. REUTERS/Ruben Sprich (SWITZERLAND - Tags: POLITICS)

Swiss Finance Minister Eveline Widmer-Schlumpf speaks to the media during a news conference after the weekly meeting of the Federal Council in Bern February 11, 2015. REUTERS/Ruben Sprich (SWITZERLAND - Tags: POLITICS BUSINESS HEADSHOT) 

Swiss Finance Minister Eveline Widmer-Schlumpf speaks to the media during a news conference after the weekly meeting of the Federal Council in Bern February 11, 2015. REUTERS/Ruben Sprich (SWITZERLAND - Tags: POLITICS BUSINESS HEADSHOT) 

Swiss Finance Minister Eveline Widmer-Schlumpf (R) speaks to media next to Swiss Secretary of State Jacques de Watteville during news conference after the weekly meeting of the Federal Council in Bern January 14, 2015. REUTERS/Thomas Hodel (SWITZERLAND) 

Swiss Finance Minister Eveline Widmer-Schlumpf (R) and Swiss Secretary of State Jacques de Watteville arrive for a news conference after the weekly meeting of the Federal Council in Bern January 14, 2015. REUTERS/Thomas Hodel (SWITZERLAND - Tags: POLITICS)

Swiss Finance Minister Eveline Widmer-Schlumpf addresses a news conference after the weekly meeting of the Federal Council in Bern January 14, 2015. REUTERS/Thomas Hodel (SWITZERLAND - Tags: POLITICS HEADSHOT)

Swiss Finance Minister Eveline Widmer-Schlumpf addresses a news conference after the weekly meeting of the Federal Council in Bern January 14, 2015. REUTERS/Thomas Hodel (SWITZERLAND - Tags: POLITICS HEADSHOT)

Members of the Federal Council (L-R) Energy Minister Doris Leuthard, Economy Minister Johann Schneider-Ammann, Finance Minister Eveline Widmer-Schlumpf, Foreign Minister Didier Burkhalter, Vice-Chancellor Thomas Helbling, Federal Chancellor Corina Casanova, Swiss President Simonetta Sommaruga, Interior Minister Alain Berset and Vice-Chancellor Andre Simonazzi assemble for their first meeting of the new year, in Bern January 14, 2015. REUTERS/Ruben Sprich (SWITZERLAND - Tags: POLITICS)

Members of the Federal Council (L-R) Foreign Minister Didier Burkhalter, Vice-Chancellor Thomas Helbling, Federal Chancellor Corina Casanova, Swiss President Simonetta Sommaruga, Vice-Chancellor Andre Simonazzi, Interior Minister Alain Berset, Finance Minister Eveline Widmer-Schlumpf, Defence Minister Ueli Maurer, Energy Minister Doris Leuthard and Economy Minister Johann Schneider-Ammann, assemble for their first meeting of the new year, in Bern January 14, 2015. REUTERS/Ruben Sprich (SWITZERLAND - Tags: POLITICS)

Swiss Finance Minister Eveline Widmer-Schlumpf takes her documents after a news conference after the last weekly meeting of the Federal Council in 2014 in Bern December 17, 2014. REUTERS/Ruben Sprich (SWITZERLAND - Tags: POLITICS BUSINESS)

Swiss Finance Minister Eveline Widmer-Schlumpf speaks to media during a news conference after the last weekly meeting of the Federal Council in 2014 in Bern December 17, 2014. REUTERS/Ruben Sprich (SWITZERLAND - Tags: POLITICS BUSINESS HEADSHOT) 

Swiss Finance Minister Eveline Widmer-Schlumpf speaks to media during a news conference after the last weekly meeting of the Federal Council in 2014 in Bern December 17, 2014. REUTERS/Ruben Sprich (SWITZERLAND - Tags: POLITICS BUSINESS HEADSHOT)