|Mode||Value (percent)||Weight (percent)|
|NAFTA trade, total||100.0||100.0|
|Other and unknown||4.5||0.1|
|U.S.-NAFTA imports, total||100.0||100.0|
|Other and unknown||3.7||0.1|
|U.S.-NAFTA exports, total||100.0||100.0|
|Other and unknown||5.5||0.2|
SOURCES: U.S. Department of Transportation, Bureau of Transportation Statistics, June 2001; based on: total, water and air dataU.S. Department of Commerce, U.S. Census Bureau, Foreign Trade Division, U.S.Exports of Merchandise CD and U.S. Imports of Merchandise CD, December 2000; truck, rail, pipeline, other and unknown dataU.S. Department of Transportation, Bureau of Transportation Statistics, Transborder Surface Freight Data, 2000; and special tabulations.