The Global Debt Database (GDD) is the result of a multiyear investigative process that started with the October 2016 Fiscal Monitor. The dataset comprises total gross debt of the (private and public) nonfinancial sector for an unbalanced panel of 190 advanced economies, emerging market economies and low-income countries, dating back to 1950.
Link data: http://bankinglibrary.com/data/systemic-risk-indicators-and-financial-crises/