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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.