Table 7,,,,,,
Value and Weight of U.S. International Merchandise Trade by Mode of Transportation: 1997 and 2001,,,,,,
Mode,Total trade,,Exports,,Imports,
,1997,2001,1997,2001,1997,2001
Value: Billions of current U.S. dollars,,,,,,
Water, 626 , 718 , 225 , 199 , 401 , 520 
Air, 433 , 519 , 220 , 251 , 213 , 267 
Truck, 323 , 395 , 167 , 192 , 157 , 204 
Rail, 70 , 93 , 19 , 23 , 51 , 69 
Pipeline, 14 , 26 , 0.2 , 0.5 , 14 , 26 
"Other, unknown, and miscellaneous ", 92 , 121 , 57 , 65 , 35 , 57 
"Total, all modes"," 1,557 "," 1,873 ", 688 , 731 , 870 ," 1,142 "
Modal shares in percent,,,,,,
Water, 40.2 , 38.4 , 32.7 , 27.2 , 46.1 , 45.5 
Air, 27.8 , 27.7 , 32.0 , 34.4 , 24.5 , 23.4 
Truck, 20.8 , 21.1 , 24.3 , 26.3 , 18.0 , 17.8 
Rail, 4.5 , 4.9 , 2.7 , 3.2 , 5.9 , 6.1 ,,,,,,
Pipeline, 0.9 , 1.4 , 0.04 , 0.1 , 1.6 , 2.3 ,,,,,,
"Other, unknown, and miscellaneous ", 5.9 , 6.5 , 8.3 , 8.9 , 4.0 , 5.0 ,,,,,,
"Total, all modes", 100.0 , 100.0 , 100.0 , 100.0 , 100.0 , 100.0 ,,,,,,
Weight: Millions of short tons1,,,,,,,,,,,,
Water," 1,144 "," 1,276 ", 408 , 361 , 736 , 915 ,,,,,,
Air, 6 , 6 , 3 , 3 , 3 , 3 ,,,,,,
Truck, 176 , 180 , 92 , 89 , 85 , 92 ,,,,,,
Rail, 84 , 97 , 22 , 22 , 62 , 75 ,,,,,,
Pipeline, 75 , 79 , 3 , 4 , 72 , 75 ,,,,,,
"Other, unknown, and miscellaneous ", 76 , 4 , 27 , 2 , 49 , 2 ,,,,,,
"Total, all modes"," 1,561 "," 1,643 ", 554 , 481 ," 1,007 "," 1,162 ",,,,,,
Modal shares in percent,,,,,,,,,,,,
Water, 73.3 , 77.7 , 73.5 , 75.1 , 73.1 , 78.7 ,,,,,,
Air, 0.4 , 0.4 , 0.5 , 0.6 , 0.3 , 0.3 ,,,,,,
Truck, 11.3 , 11.0 , 16.6 , 18.5 , 8.4 , 7.9 ,,,,,,
Rail, 5.4 , 5.9 , 4.0 , 4.6 , 6.2 , 6.5 
Pipeline, 4.8 , 4.8 , 0.5 , 0.8 , 7.2 , 6.5 
"Other, unknown, and miscellaneous ", 4.9 , 0.2 , 4.9 , 0.4 , 4.8 , 0.2 
"Total, all modes", 100.0 , 100.0 , 100.0 , 100.0 , 100.0 , 100.0 
"1  BTS estimated the export weight for truck, rail, pipeline, and other and unknown based on value-to-weight ratios from the import data. This was necessary because export weights for surface modes are not currently reported. Weight for water and air exports and imports are reported.",,,,,,
"NOTE: Excludes imports valued at less than $1,250.  Import value is based on U.S. general imports, customs values basis.  Excludes exports valued at less than $2,500.  Export value is FAS (free alongside ship) and represents the value of exports at the port of export, including the transaction price and the inland freight, insurance, and other charges.  Due to the way in which U.S. trade data are collected, the modal shares represent single modes in use at U.S. ports of entry or exit even though more than one mode may be used in transporting the goods from point of origin to destination.",,,,,,
"SOURCES: U.S. Department of Transportation, Bureau of Transportation Statistics, May 2002; based on: total, water, and air data—U.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 2001; truck, rail, pipeline, and other and unknown data—U.S. Department of Transportation, Bureau of Transportation Statistics, Transborder Surface Freight Data, 1997 and 2001; and special tabulations.",,,,,,
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