NOTE: NAFTA = North American Free Trade Agreement; U.S. NAFTA
partners are Canada and Mexico.
SOURCE: U.S. Department of Transportation, Research and
Innovative Technology Administration, Bureau of Transportation Statistics,
based on data from the Transborder Freight Data and the U.S. Department of
Commerce, U.S. International Trade Commission, ITC
Trade Dataweb, available at:
http://dataweb.usitc.gov/ as of April 2005.