"TABLE 4. Value of International Land Trade via Otay Mesa, CA by Mode: 1999-2003",,,,,,,, ($ millions),,,,,,,, " ",1999,2000,2001,2002,2003,,, Truck," 15,584 "," 18,760 "," 19,385 "," 20,368 "," 19,661 ",,, Rail, NA , NA , NA , NA , NA ,,, Pipeline, 2 , 2 , 1 , 0.2 , NA ,,, Other and unknown, 42 , 12 , 15 , 18 , 18 ,,, Total," 15,585 "," 18,761 "," 19,386 "," 20,386 "," 19,678 ",,, " SOURCE: U.S. Department of Transportation, Bureau of Transportation Statistics, Transborder Surface Freight Data, 1999-2003. ",,,,,,,, ,,,,,,,,