Table 6-2c,,,
U.S. Merchandise Trade With Canada and Mexico,,,
by Mode of Transportation,,,
(Thousands of metric tons),,,
,,,
,1990,1995,1996
,,,
Total trade with Canada ,N,N,N
    Air ,222,252,269
    Water transport ,"65,447","68,509","72,013"
    Road ,N,N,N
    Rail ,N,N,N
    Pipeline ,N,N,N
,,,
    Exports to Canada ,N,N,N
       Air ,171,215,225
       Water transport ,"25,194","25,721","24,906"
       Road ,N,N,N
       Rail ,N,N,N
       Pipeline ,N,N,N
,,,
    Imports from Canada ,N,N,N
       Air ,51,38,44
       Water transport ,"40,253","42,788","47,108"
       Road ,N,"53,564","57,805"
       Rail ,N,"46,270","48,815"
       Pipeline ,N,"61,385","62,889"
,,,
Total trade with Mexico ,N,N,N
    Air ,44,64,83
    Water transport ,"52,140","72,351","75,940"
    Road ,N,N,N
    Rail ,N,N,N
    Pipeline ,N,N,N
,,,
    Exports to Mexico ,N,N,N
       Air ,26,28,37
       Water transport ,"9,026","8,632","13,097"
       Road ,N,N,N
       Rail ,N,N,N
       Pipeline ,N,N,N
,,,
    Imports from Mexico ,N,N,N
       Air ,18,36,46
       Water transport ,"43,114","63,719","62,843"
       Road ,N,N,"14,482"
       Rail ,N,N,"4,814"
       Pipeline ,N,N,113
KEY: N = Data are nonexistent.
NOTES
Imports from Canada: The U.S. Customs Service began to require shipping weight for U.S. imports from Canada by all modes of
"transportation in 1990. However, it did not become possible to disaggregate the land modes (road, rail and pipeline) until 1994."
Imports from Mexico: The U.S. Customs Service began to require shipping weight for U.S. imports from Mexico by land modes of
"transportation (road, rail and pipeline) in April 1995."
"Road, rail and pipeline exports: For 1990, 1995 and 1996, the U.S. Census Bureau did not require shippers to report weight for export"
shipments to Canada or Mexico for these modes of transportation.

SOURCES
"Total trade: U.S. Department of Commerce. U.S. Census Bureau. Statistical Abstract of the United States. (Washington, DC: 1990,"
1995 and 1996).
Air and water: U.S. Department of Commerce. U.S. Census Bureau. Foreign Trade Division. FT920 U.S. Merchandise Trade.
"(Washington, DC: December 1990, 1995 and 1996)."
"Road, rail and pipeline: U.S. Department of Transportation. Bureau of Transportation Statistics. Transborder Surface Freight Data."
"(Washington, DC: 1998)."