NOTES FOR DATA ON THIS PAGE: Data do not include
transshipment activity. Transshipments are shipments that enter or exit the
United States by way of a U.S. Customs port on the northern or southern
border, but whose origin or destination is a country other than Canada or
Mexico. All figures are based on the
declared gross shipment weight and include packaging. Shipping weight for imports may be
underestimated because U.S. Customs Service does not require weight to be
reported at the individual commodity level for surface trade.
SOURCE FOR DATA ON THIS PAGE: U.S. Department of
Transportation, Bureau of Transportation Statistics, Transborder Surface Freight Data, available at
http://www.bts.gov/ntda/tbscd/reports.html as of
August 2002.