The research group Sentix released its survey on Tuesday. Around half of investors expect that Greece will leave the Eurozone within the next 12 months. The Sentix's Eurozone breakup index for Greece climbed to 48.3% in April from 35.5% in March.
The Sentix's breakup index for the euro zone as a whole soared to 49% in April from 36.8% a month ago.
The Sentix's survey was conducted between April 23 and 25 among 1,023 investors.