Some series are monthly, some annual. Some historical foreign trade data is available on the Census Bureau web site. For more information on on foreign trade statistics, see the Census Bureau's Guide to Foreign Trade Statistics . Standard annual summary of U.S. social, political and economic statistics with recent time series which vary from volume to volume. There is some international data and a guide to sources of material.
Older editions circulate.
Some data from the Statistical Abstract is also available on the Census Bureau web site. Detailed information on commodities and countries.