Table 4.4.—Value of the Resource, Additions, and Depletion of
All Metals, Present Discounted Value Method Using 10% Discount Rate
[Billions of current dollars]
| Year
| Opening stock
| Additions
| Depletion
| Revaluation adjustment
| Closing stock (1+2-3+4)
|
| (1) |
(2) | (3) | (4) | (5) |
| 1958 | 38.3 | -0.1 | 0.3 | 0.4 | 38.4 |
| 1959 | 38.4 | -.1 | .3 | 1.4 | 39.5 |
| 1960 | 39.5 | -1.1 | .3 | .9 | 39.0 |
| 1961 | 39.0 | 1.1 | .3 | 1.4 | 41.1 |
| 1962 | 41.1 | 2.1 | .3 | 1.5 | 44.4 |
| 1963 | 44.4 | .8 | .4 | 1.8 | 46.6 |
| 1964 | 46.6 | 1.8 | .4 | 1.6 | 49.6 |
| 1965 | 49.6 | 1.3 | .4 | 1.4 | 51.8 |
| 1966 | 51.8 | 1.2 | .5 | 1.0 | 53.6 |
| 1967 | 53.6 | 1.2 | .4 | 1.3 | 55.7 |
| 1968 | 55.7 | 1.2 | .4 | 1.6 | 58.1 |
| 1969 | 58.1 | .1 | .6 | 2.2 | 59.8 |
| 1970 | 59.8 | 1.2 | .6 | 2.8 | 63.2 |
| 1971 | 63.2 | 2.0 | .6 | 3.0 | 67.6 |
| 1972 | 67.6 | .7 | .6 | 2.7 | 70.3 |
| 1973 | 70.3 | 0 | .7 | 5.3 | 74.9 |
| 1974 | 74.9 | 1.3 | .7 | 11.0 | 86.4 |
| 1975 | 86.4 | -1.1 | .8 | 14.2 | 98.7 |
| 1976 | 98.7 | .4 | .9 | 12.6 | 110.9 |
| 1977 | 110.9 | 1.7 | .8 | 9.2 | 121.0 |
| 1978 | 121.0 | .8 | .9 | -5.5 | 115.4 |
| 1979 | 115.4 | 1.0 | .9 | -5.3 | 110.2 |
| 1980 | 110.2 | -1.3 | .8 | -9.8 | 98.3 |
| 1981 | 98.3 | -2.9 | .7 | -18.7 | 76.0 |
| 1982 | 76.0 | -2.0 | .2 | -22.6 | 51.2 |
| 1983 | 51.2 | -1.4 | .4 | 28.6 | 78.0 |
| 1984 | 78.0 | -3.7 | .6 | 26.6 | 100.2 |
| 1985 | 100.2 | 4.3 | .8 | 22.6 | 126.4 |
| 1986 | 126.4 | 5.5 | .9 | 17.4 | 148.3 |
| 1987 | 148.3 | 5.5 | 1.3 | 17.2 | 169.7 |
| 1988 | 169.7 | 6.5 | 1.7 | 1.3 | 175.7 |
| 1989 | 175.7 | 8.7 | 2.2 | 6.1 | 188.4 |
| 1990 | 188.4 | 8.4 | 2.4 | 1.0 | 195.3 |
| 1991 | 195.3 | 8.1 | 2.3 | -.3 | 200.8 |
Table 4.3
