| Year | Crude oil | Natural gas | Natural gas liquids |
| billion barrels | trillion cubic feet | billion barrels | |
| of 42 U.S. gallons | 14.73 psia, 60 degrees F | of 42 U.S. gallons | |
| 1977 | 31.8 | 207.4 | na |
| 1978 | 31.4 | 208.0 | 6.8 |
| 1979 | 29.8 | 201.0 | 6.6 |
| 1980 | 29.8 | 199.0 | 6.7 |
| 1981 | 29.4 | 201.7 | 7.1 |
| 1982 | 27.9 | 201.5 | 7.2 |
| 1983 | 27.7 | 200.5 | 7.9 |
| 1984 | 28.4 | 197.5 | 7.6 |
| 1985 | 28.4 | 193.4 | 7.9 |
| 1986 | 26.9 | 191.6 | 8.2 |
| 1987 | 27.3 | 187.2 | 8.1 |
| 1988 | 26.8 | 168.0 | 8.2 |
| 1989 | 26.5 | 167.1 | 7.8 |
| 1990 | 26.3 | 169.3 | 7.6 |
| 1991 | 24.7 | 167.1 | 7.5 |
| 1992 | 23.7 | 165.0 | 7.5 |
| 1993 | 23.0 | 162.4 | 7.2 |
| 1994 | 22.5 | 163.8 | 7.2 |
| 1995 | 22.4 | 165.1 | 7.4 |
| 1996 | 22.0 | 166.5 | 7.8 |
| 1997 | 22.6 | 167.2 | 7.9 |
| 1998 | 21.0 | 164.0 | 7.5 |
| 1999 | 21.7 | 167.4 | 7.9 |
Source: U.S. Department of Energy, Energy Information Administration, Advance Summary U.S. Crude Oil, Natural Gas, and Natural Gas Liquids Reserves 1999 Annual Report, DOE/EIA-0216(99) Advanced Summary (GPO, Washington, DC, 2000).
Note: An unusually large revision decrease to North Slope dry natural gas reserves was made in 1988. It recognizes some 24.6 trillon cubic feet of downward revisions reported during prior years by operators because of economic and market conditions. The Energy Information Administration in previous years carried these reserves in the proved category. Estimates are for the end of the calendar year.
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