|Mode||Value (percent)||Weight (percent)|
|Value, 2000||Value, 2001||Weight, 2000||Weight, 2001|
|NAFTA trade, total||100.0||100.0||100.0||100.0|
|Other and unknown||4.5||5.4||0.1||0.2|
SOURCES: U.S. Department of Transportation, Bureau of Transportation Statistics, special tabulation, May 2002; based on total trade, air, and water data-U.S. Department of Commerce, U.S. Census Bureau, Foreign Trade Division, FT920 U.S. Merchandise Trade 2000 to 2001 (Washington, DC: 2000-2001); all land modes-U.S. Department of Transportation. Bureau of Transportation Statistics, Transborder Surface Freight Data, as of January 2002.