Bookmaker William Hill has suspended betting on Greece leaving the Eurozone in 2015 after heavy betting on the 'Grexit'.The bookie also stopped taking money on which country would be the first to leave the single currency bloc, although rivals Paddy Power and Betfair were still offering odds of 3/1 and 13/8 respectively on Greece to leave the Eurozone in 2015.In a statement released on Thursday, Hills said a potential Greek exit had been heavily backed, with odds on Athens being the first country to leave the Eurozone shortening to as much as 1/5."It is now looking increasingly likely that they [the Greek government] could begin the process of departing very shortly," said William Hill spokesman Graham Sharpe.The bookmaker said that it had also shortened the odds on Greece leaving the single currency before the end of the year from 5/1 to 3/1, adding that punters did not seem interested in backing Greece to stay in the Eurozone until the end of 2015."We decided to pull the plug on the markets until either the decision to leave is taken, or the crisis point passes and a plan is put in place enabling the country to remain in," said Sharpe.