4. Long-Term Debt Outstanding, Low- and Middle-Income Countries, 1970-2006, in Trillions of Current Dollars Source: World Bank, World Development Indicators .
5. Debt/GDP and Debt Service/Exports of Goods and Services in Percentages, 1981-2006, Emerging and Developing Countries Source: World Bank, World Development Indicators; International Monetary Fund, World Economic Outlook Database, April 2008 . Debt service data are for low and middle income countries.