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Riot police has blocked a street to prevent protestorsfrom gathering outside Greece's parliament during a protest on February 20, 2013 in Athens, Greece. Unions have launched general strike against austerity measures in Greece, amid predictions unemployment in the crisis-hit country will reach 30 percent this year. (Photo by Milos Bicanski/Getty Images)

Protestors shouts slogans outside Greece's parliament during a protest on February 20, 2013 in Athens, Greece. Unions have launched general strike against austerity measures in Greece, amid predictions unemployment in the crisis-hit country will reach 30 percent this year. (Photo by Milos Bicanski/Getty Images)

Protesters march during an anti-austerity rally in central Athens February 20, 2013. Tens of thousands of Greeks took to the streets of Athens on Wednesday during a nationwide strike against wage cuts and high taxes that kept ferries stuck in ports, schools shut and hospitals with only emergency staff. REUTERS/John Kolesidis

A demonstrator shouts slogans in front of riot police during a 24-hour general strike in Athens on February 20, 2013. Greece was hit by a new strike on February 20 called by leading unions against unrelenting austerity in the recession-weary nation ahead of an audit by international creditors, disrupting flights, ferries and hospital services. The strike -- the first general work stoppage in debt-crippled Greece this year -- has forced airport authorities to scrap or reschedule dozens of flights while hospitals were operating on reduced staffing. ARIS MESSINIS/AFP/Getty Images

Members of pro-communist union PAME gather during a protest in Athens, Wednesday, Feb. 20, 2013. Thousands of anti-austerity demonstrators took to the streets of Athens on Wednesday as unions staged a general strike to protest the government's spending cuts and tax hikes, which some predict will push unemployment to a stunning 30 percent this year. (AP Photo/Kostas Tsironis)

Riot police run by closed shops after protesters threw a petrol bomb following an anti-austerity march during a 24-hour strike in Athens February 20, 2013. Tens of thousands of Greeks took to the streets of Athens on Wednesday during a nationwide strike against wage cuts and high taxes that kept ferries stuck in ports, schools shut and hospitals with only emergency staff. REUTERS/Giorgos Moutafis

Workers shouts slogans outside Greece's parliament during a protest on February 20, 2013 in Athens, Greece. Unions have launched general strike against austerity measures in Greece, amid predictions unemployment in the crisis-hit country will reach 30 percent this year. (Photo by Milos Bicanski/Getty Images)

Masked protesters throw rocks at policemen following an anti-austerity march during a 24-hour strike in Athens February 20, 2013. Tens of thousands of Greeks took to the streets of Athens on Wednesday during a nationwide strike against wage cuts and high taxes that kept ferries stuck in ports, schools shut and hospitals with only emergency staff. REUTERS/Costas Baltas/ICON

Protesters march during an anti-austerity rally in central Athens February 20, 2013. Tens of thousands of Greeks took to the streets of Athens on Wednesday during a nationwide strike against wage cuts and high taxes that kept ferries stuck in ports, schools shut and hospitals with only emergency staff. The banner reads, "Jobs" REUTERS/John Kolesidis

Protestors shout slogans outside Greece's parliament during a protest on February 20, 2013 in Athens, Greece. Unions have launched general strike against austerity measures in Greece, amid predictions unemployment in the crisis-hit country will reach 30 percent this year. (Photo by Milos Bicanski/Getty Images)

Roit police has blocked a road outside Greece's parliament during a protest on February 20, 2013 in Athens, Greece. Unions have launched general strike against austerity measures in Greece, amid predictions unemployment in the crisis-hit country will reach 30 percent this year. (Photo by Milos Bicanski/Getty Images)

Protestor with a mask outside Greece's parliament during a protest on February 20, 2013 in Athens, Greece. Unions have launched general strike against austerity measures in Greece, amid predictions unemployment in the crisis-hit country will reach 30 percent this year. (Photo by Milos Bicanski/Getty Images)

Riot police outside Greece's parliament during a protest on February 20, 2013 in Athens, Greece. Unions have launched general strike against austerity measures in Greece, amid predictions unemployment in the crisis-hit country will reach 30 percent this year. (Photo by Milos Bicanski/Getty Images)

Members of union PAME gather outside Greece's parliament during a protest on February 20, 2013 in Athens, Greece. Unions have launched general strike against austerity measures in Greece, amid predictions unemployment in the crisis-hit country will reach 30 percent this year. (Photo by Milos Bicanski/Getty Images)

Police stand guard while thousands of protesters march in central Athens during a 24-hour-general strike on February 20, 2013. Thousands of Greeks joined new anti-austerity protests on February 20, causing massive disruption to flights, ferries and hospital services in the debt-ridden country's first general strike this year. About 15,000 protesters took part in a Communist-organised demonstration in Athens and 20,000 more joined protests organised by other unions, according to police figures. LOUISA GOULIAMAKI/AFP/Getty Images

Members of the 'I won't pay' movement march on February 20, 2013 in central Athens during a 24-hour-general strike. Thousands of Greeks joined new anti-austerity protests on February 20, causing massive disruption to flights, ferries and hospital services in the debt-ridden country's first general strike this year. About 15,000 protesters took part in a Communist-organised demonstration in Athens and 20,000 more joined protests organised by other unions, according to police figures. LOUISA GOULIAMAKI/AFP/Getty Images

Demonstrators march on February 20, 2013 in Athens during a 24-hours general strike called by leading unions against unrelenting austerity in the recession-weary nation ahead of an audit by international creditors, disrupting flights, ferries and hospital services. The strike, the first general work stoppage in debt-crippled Greece this year, has forced airport authorities to sscrap or reschedule dozens of flights while hospitals were operating on reduced staffing. ARIS MESSINIS/AFP/Getty Images

Wearing Guy Fawkes masks, demonstrators take part in a march on February 20, 2013 in Athens, during a 24-hours general strike called by leading unions against unrelenting austerity in the recession-weary nation ahead of an audit by international creditors, disrupting flights, ferries and hospital services. The strike, the first general work stoppage in debt-crippled Greece this year, has forced airport authorities to sscrap or reschedule dozens of flights while hospitals were operating on reduced staffing. ARIS MESSINIS/AFP/Getty Images