TABLE 2-7a  Change in Domestic Freight Ton-Miles by Mode: 1991–2001,,,,,,,,,,,
"Index: 1991 = 1.00
",,,,,,,,,,,
Year,1991,1992,1993,1994,1995,1996,1997,1998,1999,2000,2001
Air,1.00,1.11,1.20,1.33,1.41,1.45,1.54,1.56,1.60,1.69,1.48
Truck,1.00,1.03,1.07,1.14,1.20,1.23,1.29,1.33,1.37,1.39,1.40
Railroad,1.00,1.05,1.09,1.17,1.26,1.32,1.34,1.39,1.44,1.48,1.53
Water,1.00,1.01,0.93,0.96,0.95,0.90,0.83,0.79,0.77,0.76,0.73
Oil and natural gas pipeline ,1.00,1.02,1.04,1.04,1.07,1.10,1.10,1.10,1.09,1.04,1.02
Total,1.00,1.03,1.04,1.09,1.13,1.15,1.15,1.17,1.19,1.19,1.20
"
SOURCES:  Air, oil pipeline, and water—U.S. Department of Transportation (USDOT), Bureau of Transportation Statistics (BTS), National Transportation Statistics 2002, table 1-44 revised, available at http://www.bts.gov/, as of October 2003.  Truck, rail, natural gas pipeline—USDOT, BTS, calculations based on data from various sources as follows:  Truck—USDOT, BTS, Transportation Statistics Annual Report 2000 (Washington, DC: 2001), p. 124, table 2; US International Trade and Freight Transportation Trends (Washington, DC: 2003), figure 14; USDOT, BTS, Martime Trade and Transportation 2002 (Washington, DC: 2002), table 1-20; and USDOT, Federal Highway Administration, Highway Statistics 2001 (Washington DC: 2002), table VM-1. ",,,,,,,,,,,
"Rail—Surface Transportation Board, Carload Waybill Sample; Transport Canada, Transportation in Canada, Addendum (Ottawa, Ontario: Annual issues), table A6-10; and Association of American Railroads, Railroad Facts (Washington, DC: 1991-2001 issues), p. 36.  Natural gas pipeline—U.S. Department of Energy (DOE), Energy Information Administration (EIA), Annual Energy Review 2001 (Washington, DC: 2002), table 6.5, and DOE, EIA, International Energy Annual 2001 (Washington, DC: 2003), table C-1. ",,,,,,,,,,,