Description: 

UN Comtrade provides annual international trade statistics by commodity (Harmonised System and the Standard International Trade Classification).  All values are converted in US dollars and metric units and the coverage dates as far back as 1962. Ideal for finding historical data on trade by commodity in between nations.

When To Use: 

Use when searching for detailed international trade data between countries.  For U.S. trade data, also search TradeStats Express, the U.S. Census Bureau, and Import Genius.