| Year | Billions of current dollars | Billions of 1987 dollars | |||||||
| Opening stock | Additions | Depletion | Revaluation adjustment | Closing stock (1+2-3+4) | Opening stock | Additions | Depletion | Closing stock/1/ (6+7-8) | |
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | |
| 1958 | 155.6 | 6.1 | 5.6 | 5.0 | 161.1 | 921.6 | 42.0 | 34.6 | 929.4 |
| 1959 | 161.1 | 7.6 | 5.7 | -1.1 | 161.9 | 929.4 | 52.0 | 36.5 | 946.0 |
| 1960 | 161.9 | 3.4 | 5.9 | 4.5 | 163.9 | 946.0 | 27.5 | 37.5 | 935.1 |
| 1961 | 163.9 | 7.9 | 6.0 | 3.5 | 169.3 | 935.1 | 48.9 | 38.2 | 946.4 |
| 1962 | 169.3 | 9.2 | 6.2 | 3.5 | 176.0 | 946.4 | 54.5 | 39.3 | 962.6 |
| 1963 | 176.0 | 7.5 | 6.5 | 4.6 | 181.6 | 962.6 | 46.8 | 41.0 | 968.6 |
| 1964 | 181.6 | 10.0 | 6.7 | .2 | 185.1 | 968.6 | 58.7 | 42.4 | 986.0 |
| 1965 | 185.1 | 9.8 | 6.8 | -.4 | 187.7 | 986.0 | 60.6 | 43.7 | 1,003.9 |
| 1966 | 187.7 | 9.1 | 7.1 | -1.2 | 188.5 | 1,003.9 | 56.9 | 46.5 | 1,014.8 |
| 1967 | 188.5 | 9.2 | 7.4 | 2.8 | 193.1 | 1,014.8 | 57.5 | 48.7 | 1,024.0 |
| 1968 | 193.1 | 7.5 | 7.6 | .1 | 193.1 | 1,024.0 | 44.7 | 50.7 | 1,017.4 |
| 1969 | 193.1 | 4.5 | 7.9 | 2.1 | 191.8 | 1,017.4 | 28.6 | 52.7 | 991.3 |
| 1970 | 191.8 | 24.7 | 8.7 | 14.2 | 222.0 | 991.3 | 146.7 | 55.3 | 1,089.1 |
| 1971 | 222.0 | 8.7 | 9.0 | 6.9 | 228.5 | 1,089.1 | 41.5 | 54.8 | 1,074.7 |
| 1972 | 228.5 | 5.5 | 9.3 | 6.4 | 231.2 | 1,074.7 | 29.3 | 55.2 | 1,046.7 |
| 1973 | 231.2 | 5.6 | 9.6 | 36.1 | 263.4 | 1,046.7 | 29.7 | 55.2 | 1,020.3 |
| 1974 | 263.4 | 10.2 | 11.9 | 68.2 | 329.8 | 1,020.3 | 37.4 | 52.9 | 1,004.0 |
| 1975 | 329.8 | 7.9 | 15.4 | 86.8 | 409.2 | 1,004.0 | 25.9 | 50.3 | 978.7 |
| 1976 | 409.2 | 11.4 | 20.3 | 76.6 | 476.9 | 978.7 | 25.3 | 50.3 | 953.1 |
| 1977 | 476.9 | 28.9 | 23.3 | 48.0 | 530.5 | 953.1 | 57.1 | 50.5 | 959.8 |
| 1978 | 530.5 | 19.4 | 25.9 | 30.5 | 554.5 | 959.8 | 38.6 | 52.3 | 945.9 |
| 1979 | 554.5 | 36.4 | 30.9 | 92.4 | 652.4 | 945.9 | 56.6 | 53.7 | 949.6 |
| 1980 | 652.4 | 42.8 | 37.3 | 109.8 | 767.7 | 949.6 | 60.1 | 53.9 | 956.7 |
| 1981 | 767.7 | 35.1 | 42.9 | 14.9 | 774.8 | 956.7 | 39.3 | 53.6 | 942.6 |
| 1982 | 774.8 | 42.4 | 62.6 | 157.3 | 911.8 | 942.6 | 31.7 | 51.7 | 922.8 |
| 1983 | 911.8 | 71.2 | 80.6 | 215.5 | 1,117.9 | 922.8 | 37.6 | 50.2 | 911.0 |
| 1984 | 1,117.9 | 86.3 | 84.1 | 19.6 | 1,139.6 | 911.0 | 47.8 | 53.1 | 906.5 |
| 1985 | 1,139.6 | 80.4 | 76.6 | -105.0 | 1,038.4 | 906.5 | 58.5 | 52.6 | 914.1 |
| 1986 | 1,038.4 | 54.0 | 62.7 | -87.2 | 942.4 | 914.1 | 47.2 | 51.3 | 911.3 |
| 1987 | 942.4 | 54.3 | 51.3 | -104.2 | 841.4 | 911.3 | 54.3 | 51.3 | 916.0 |
| 1988 | 841.4 | 28.1 | 37.5 | -97.6 | 734.4 | 916.0 | 35.8 | 52.3 | 900.6 |
| 1989 | 734.4 | 42.4 | 37.3 | 26.5 | 766.0 | 900.6 | 54.7 | 51.3 | 904.1 |
| 1990 | 766.0 | 50.9 | 41.8 | 37.2 | 812.4 | 904.1 | 60.7 | 51.5 | 913.6 |
| 1991 | 812.4 | 36.3 | 43.1 | -.1 | 805.4 | 913.6 | 42.3 | 51.4 | 903.9 |
1. Because of the simplifying assumptions used in the calculation of stocks for this method, closing stocks are not necessarily equal to opening stocks plus additions less depletion. For most years, the differences are very small.
