External debt - Country rankings:
The average for 2017 was 52.22 percent.The highest value was in Mongolia: 285.54 percent and the lowest value was in Iran: 1.42 percent. Below is a chart for all countries where data are available for: External debt.
External debt, percent of Gross National Income, 2017
(percent, Source: The World Bank, TheGlobalEconomy.com)