A protester clashes with a police officer in Athens' central Syntagma (Constitution) Square in this June 15, 2011 file photo. Greece triggered the regional financial crisis in 2009 when a far higher budget deficit than previously calculated emerged. The collapse of talks with creditors in Paris last November set off a month-long sequence of events leading to elections this week and proving Greece is still the region's weak link. The vote is expected to be won by Syriza, a far-left party opposed to the bailout, worrying investors and creditors alike. (Photo by Yannis Behrakis/Reuters)

George Andrianakis, 56, drags one of his goats in the yard of his farm in the village of Stafania in the Peloponesse area of Greece, in this March 21, 2012 file photo. (Photo by Cathal McNaughton/Reuters)

Lawmaker of the far-right Golden Dawn party Ilias Panagiotaros delivers a speech during a pre-election rally in Athens in this May 23, 2014 file picture. (Photo by Yorgos Karahalis/Reuters)

Pensioners applaud in front of the Health Ministry as they take part in an anti-austerity rally in Athens in this September 4, 2012 file photo. (Photo by John Kolesidis/Reuters)

A farmer shouts during a protest outside Greece's Agriculture Ministry in Athens in this November 25, 2014 file photo. (Photo by Alkis Konstantinidis/Reuters)

A man walks past a banner with an image of opposition leader and head of radical leftist Syriza party Alexis Tsipras at the party's pre-election kiosk in Athens in this January 15, 2015 file photo. (Photo by Alkis Konstantinidis/Reuters)

Greek riot policemen rest in front of graffiti written on the wall of a bank during violent demonstrations over austerity measures in Athens, in this May 5, 2010 file photo. (Photo by Yorgos Karahalis/Reuters)

A demonstrator jumps to attempt to break a window displaying an image of an ancient greek galley during protests against austerity measures in Athens, in this June 28, 2011 file photo. (Photo by Yorgos Karahalis/Reuters)

A cleaning lady sweeps the floor at the Athens stock exchange in this July 21, 2011 file photo. (Photo by Yannis Behrakis/Reuters)

Immigrants and asylum seekers, with their mouths taped, protest to demand for asylum in central Athens in this February 1, 2011 file photo. (Photo by John Kolesidis/Reuters)

A woman picks her way past a burned-out shop after a night of violence which followed the Greek parliament approval of a deeply unpopular austerity bill in Athens, in this February 13, 2012 file photo. (Photo by John Kolesidis/Reuters)

A man drinks coffee in front of a mural near the coastal town of Kalamatta in the Messinia area of Greece in this March 23, 2012 file photo. (Photo by Cathal McNaughton/Reuters)

Greek parliament employees raise a mast after they replaced torn-off Greek flag with a new one atop the parliament in Athens Syntagma (Constitution) square in this April 18, 2012 file photo. (Photo by Yannis Behrakis/Reuters)

A branch of the Bank of Greece is seen stained with red paint thrown by demonstrators during a protest in central Athens, in this December 6, 2010 file photo. (Photo by Yannis Behrakis/Reuters)

Protesters gesture in front of the Greek parliament during a rally against government austerity measures in Athens in this June 29, 2010 file photo. (Photo by John Kolesidis/Reuters)

A protester wearing a gas mask walks beside a burning van during violent protests against austerity measures in Athens, in this June 28, 2011 file photo. (Photo by Yannis Behrakis/Reuters)

A demonstrator is detained by riot police during anti-austerity protests in Athens, in this June 29, 2011 file photo. (Photo by John Kolesidis/Reuters)

Policemen are set ablaze on fire by a petrol bomb thrown by protesters during clashes near the Parliament building in Syntagma (Constitution) square in Athens in this October 20, 2011 file photo. (Photo by Yannis Behrakis/Reuters)

Greeks struggle as they wait to receive free onions and other vegetables offered by farmers in Syntagma Square in this January 25, 2012 file photo. (Photo by Yannis Behrakis/Reuters)

A man pushes his motorbike near a banner of opposition radical leftist Syriza party in Athens January 21, 2015. The parliamentary elections will take place on Sunday. (Photo by Marko Djurica/Reuters)