Now it is somewhat inaccurate to attribute the economic downturn effects entirely to the financial crisis because there would probably have been some sort of slowdown even without a crisis. There will always be a business cycle, after all, and deficits and debt rise when downturns occur.
As a comparison, the rise in the debt ratio of the G7 from 2000 to 2005 associated with the previous cyclical downturn – which was not an especially deep one – was around 12 percentage points. Nonetheless the recent downturn was a bad one in many countries, and that is because it was associated with a financial crisis.