(billions)
| 1990 | 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003p | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Intercity truck (NTS, Eno)1, 2 | 735 | 758 | 815 | 861 | 908 | 921 | 972 | 996 | 1,027 | 1,059 | 1,074 | 1,051 | ||
| All truck, 1997 base (improved BTS) | 854 | 874 | 896 | 936 | 996 | 1,042 | 1,071 | 1,119 | 1,149 | 1,186 | 1,203 | 1,224 | 1,255 | 1,264 |
1 U.S. Department of Transportation, Bureau of Transportation Statistics, National Transportation Statistics (Washington, DC: 2003), table 1-44.
2 Eno Transportation Foundation, Transportation in America (Washington, DC: 2002), p. 42.
Key: p = preliminary.