The BIS provides statistics on the exposure of the main banking systems on the debtor countries. These are available in tables 9D and 9E (consolidated claims on ultimate risk basis) of the BIS Consolidated Banking Statistics. The most recent data is at end-December 2010 . Historical time series are also available in csv format. More precisely bilateral claims of banks on individual countries are available in table 9E.
Statistics on the overall external debt of a country from the data reported by its creditors are available on the Joint External Debt Hub (JEDH) in the creditor/market tables. JEDH also provides the external debt data as reported by the debtor country itself (national tables).