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Highway Expenditures per Vehicle Miles of Travel
| Total Expenditures/Vehicle Miles of Travel (Current Cents) | Total Expenditures/Vehicle Miles of Travel (1970 Cents) | Capital Expenditures/Vehicle Miles of Travel (Current Cents) | Capital Expenditures/Vehicle Miles of Travel (1970 Cents) | CPI - 1970 base | |
|---|---|---|---|---|---|
| 1970 | 1.88 | 1.88 | 1.04 | 1.04 | 100.00 |
| 1971 | 1.91 | 1.82 | 1.04 | 1.00 | 104.38 |
| 1972 | 1.84 | 1.68 | 0.97 | 0.88 | 107.73 |
| 1973 | 1.84 | 1.56 | 0.93 | 0.76 | 114.43 |
| 1974 | 2.04 | 1.42 | 1.02 | 0.62 | 127.06 |
| 1975 | 2.16 | 1.43 | 1.08 | 0.65 | 138.66 |
| 1976 | 2.09 | 1.36 | 0.99 | 0.61 | 146.65 |
| 1977 | 2.03 | 1.25 | 0.89 | 0.52 | 156.19 |
| 1978 | 2.16 | 1.19 | 0.97 | 0.48 | 168.04 |
| 1979 | 2.45 | 1.16 | 1.15 | 0.47 | 187.11 |
| 1980 | 2.73 | 1.14 | 1.33 | 0.48 | 212.37 |
| 1981 | 2.73 | 1.09 | 1.27 | 0.47 | 234.28 |
| 1982 | 2.71 | 1.08 | 1.19 | 0.47 | 248.71 |
| 1983 | 2.79 | 1.10 | 1.22 | 0.49 | 256.70 |
| 1984 | 2.95 | 1.10 | 1.34 | 0.51 | 267.78 |
| 1985 | 3.24 | 1.14 | 1.50 | 0.51 | 277.32 |
| 1986 | 3.40 | 1.19 | 1.59 | 0.55 | 282.47 |
| 1987 | 3.40 | 1.17 | 1.60 | 0.56 | 292.78 |
| 1988 | 3.38 | 1.11 | 1.62 | 0.53 | 304.90 |
| 1989 | 3.38 | 1.07 | 1.58 | 0.51 | 319.59 |
| 1990 | 3.52 | 1.08 | 1.64 | 0.53 | 336.86 |
| 1991 | 3.62 | 1.10 | 1.69 | 0.55 | 351.03 |
| 1992 | 3.72 | 1.12 | 1.70 | 0.57 | 361.60 |
| 1993 | 3.76 | 1.10 | 1.72 | 0.55 | 372.42 |
| 1994 | 3.83 | 1.08 | 1.80 | 0.54 | 381.96 |
| 1995 | 3.86 | 1.04 | 1.83 | 0.52 | 392.78 |
| 1996 | 3.95 | 1.06 | 1.88 | 0.55 | 404.38 |
| 1997 | 3.98 | 1.01 | 1.89 | 0.50 | 413.66 |
| 1998 | 4.08 | 1.04 | 1.97 | 0.54 | 420.10 |
| 1999 | 4.13 | 1.01 | 2.13 | 0.54 | 429.38 |
| 2000 | 4.40 | 1.02 | 2.35 | 0.56 | 443.81 |
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