A staggering €8bn-€10bn (£7bn-£8.7bn) may have been taken out of Greece by private investors since it became engulfed by economic turmoil in November.

Under pressure from the European Union and international markets to rein in the nation's €300bn debt, socialist prime minister, George Papandreou, announced last week that he would have to enforce tough deficit-cutting measures. But the coming austerity package is leading panicked wealthy Greeks to divert their savings out of the country.

"In the last four to six weeks a lot of money has been moved abroad; I've heard extraordinary figures," analyst, Kostas Panagopoulos said.

"People are moving funds either because they don't trust our banking system, want to avoid what they fear will be taxes on deposits or are simply anxious about the future of our economy."

Traditionally, the country's super-rich, not least ship owners and mercantile elite, have favoured the Swiss bank and off-shore account. But now huge sums are also being spirited away to banks in Cyprus. "Very big transactions are going through Cypriot banks," added Pana­gopoulos. "Greeks feel that Cyprus is not only close, but safe."

In the 29 years since Greece entered what was then the European Community, it has increasingly become divided between the very rich, who live in Hollywood-style opulence in the outer suburbs, and the poor, who are forced to survive on pensions of €500 a month.

While a fifth of the population lives beneath the poverty line, some 20% of Greeks are believed to earn more than €100,000 annually – even if, according to income tax records, 90% declare salaries of less than €30,000 a year.

"Greece has a lot of rich people who are not being taxed properly because there is so much tax evasion," finance minister Giorgos Papaconstantinou, told the Observer. "If you look at the actual numbers, you will see that the number of people declaring over €100,000 a year is roughly 15,000," he said. "I don't think that there is anyone in this country who believes there are only 15,000 Greeks earning more than €100,000 a year."

The growing flight of funds from Greece has whipped up much resentment among the public. "It's revolting," said one popular radio chat-show host last week. "After pillaging the country, they flee with their ill-gotten gains at the very mention of the word tax."