NOTE: Current dollar data are available in table 114 in appendix B and were adjusted using a chain-type index to eliminate the effects of inflation over time.
SOURCE: 1991–2001 fuel prices—U.S. Department of Transportation (USDOT), Bureau of Transportation Statistics (BTS), National Transportation Statistics 2002> (Washington, DC: 2002), table 3-8, also available at http://www.bts.gov. 2002 fuel prices—See table 114 source. Per capita vehicle- and aircraft-miles—Calculations based on USDOT, BTS, National Transportation Statistics 2002 (Washington, DC: 2002), table 1-29, also available at http://www.bts.gov; and U.S. Department of Commerce, U.S. Census Bureau, International Database (IDB), available at http://www.census.gov/ipc/www/idbnew.html, as of April 2003.