>draconian austerity measures like those of the last few years, which caused a 25% drop in GDP and a rise of the debt/GDP ratio from 105% to 175%
Easy there. The austerity measures and the troika only came into play in 2010. After Greek government called EC-ECB-IMF because it could not solve its own crisis.
By 2010 (prior to Troika-imposed austerity), as a result of the Global Recession, Greece had already lost about 15% of its GDP and its debt had risen to about ~150% of its GDP.
It is extremely disingenuous to say that austerity caused a 25% drop in GDP or that it caused the debt/GDP ratio to go from 105% to 175%.