"FIGURE 3. Value of U.S. Merchandise Trade by Land, Water, and Air Gateways: 1990–2003",,,,,,
(Percent),,,,,,
,U.S. total land trade1,U.S. total water trade,U.S. total air trade,Other and unknown2,,
1990, 22.9 , 48.9 , 22.7 , 5.6 ,,
2003, 28.4 , 40.9 , 26.4 , 4.3 ,,
"1 Includes truck, rail, pipeline, and miscellaneous surface modes.",,,,,,
"2 Includes purchased vehicles such as aircraft or boats moving from manufacturer to customer where the vehicle itself is the shipment, pedestrians carrying freight, and miscellaneous.  ",,,,,,
"SOURCE: U.S. Department of Transportation, Bureau of Transportation Statistics, based on total trade, from U.S. International Trade Commission, USITC Interactive Tariff and Trade Dataweb, available at http://dataweb.usitc.gov/ as of Sept. 15, 2004.",,,,,,
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