Calculated by multiplying each country's IMF's Debt to GDP% X 2015 GDP (purchasing power parity valuation)

Richest Research Sources

1. Debt/GDP Statistics by Country International Monetary Fund's World Economic Outlook database

2. Latest Global Trade Statistics World's Top Exports (WTEx) 3. Trade Partners by Country CIA World Factbook

4. USA Trade Goods by Country Census Bureau Foreign Trade Statistics