gross federal debt as a percent of GDP

http://en.wikipedia.org/wiki/National_debt_by_U.S._presidential_terms

This link has a chart of Presidents since 1945, with their beginning public debt to GDP ratio, ending debt to GDP ratio, increase in debt (in trillions of dollars), and percentage of increase in debt to GDP ratio.

Since 1973, we have had an increase in the ratio of public debt to GDP ration for every Republican president, and a decrease for every Democratic president.