Table 5.4.—Value of the Resource,
Additions, and Depletion of Other Minerals, 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 | 11.9 | 0.1 | 0.1 | 0 | 11.9 |
| 1959 | 11.9 | .1 | .1 | .3 | 12.2 |
| 1960 | 12.2 | .1 | .1 | .5 | 12.6 |
| 1961 | 12.6 | .2 | .1 | .6 | 13.2 |
| 1962 | 13.2 | .2 | .1 | .5 | 13.8 |
| 1963 | 13.8 | .2 | .1 | .3 | 14.2 |
| 1964 | 14.2 | .3 | .1 | 0 | 14.4 |
| 1965 | 14.4 | .3 | .2 | .2 | 14.7 |
| 1966 | 14.7 | .3 | .2 | .3 | 15.1 |
| 1967 | 15.1 | .2 | .2 | .3 | 15.3 |
| 1968 | 15.3 | .1 | .2 | -.6 | 14.6 |
| 1969 | 14.6 | 0 | .2 | -1.0 | 13.5 |
| 1970 | 13.5 | .1 | .1 | -.9 | 12.5 |
| 1971 | 12.5 | .1 | .1 | -.6 | 11.9 |
| 1972 | 11.9 | .1 | .1 | -.3 | 11.6 |
| 1973 | 11.6 | .1 | .1 | 1.1 | 12.6 |
| 1974 | 12.6 | .2 | .2 | 3.2 | 15.9 |
| 1975 | 15.9 | .2 | .2 | 4.5 | 20.4 |
| 1976 | 20.4 | .3 | .3 | 3.6 | 24.0 |
| 1977 | 24.0 | .5 | .4 | 1.7 | 25.8 |
| 1978 | 25.8 | .7 | .4 | 1.0 | 27.1 |
| 1979 | 27.1 | .5 | .5 | 3.0 | 30.1 |
| 1980 | 30.1 | -.2 | .5 | 4.8 | 34.1 |
| 1981 | 34.1 | -.3 | .6 | 4.5 | 37.7 |
| 1982 | 37.7 | -.5 | .5 | 2.4 | 39.1 |
| 1983 | 39.1 | -.6 | .5 | 1.5 | 39.6 |
| 1984 | 39.6 | -.5 | .6 | .7 | 39.2 |
| 1985 | 39.2 | .4 | .6 | 1.0 | 40.0 |
| 1986 | 40.0 | .3 | .5 | .7 | 40.4 |
| 1987 | 40.4 | 0 | .5 | .2 | 40.1 |
| 1988 | 40.1 | .1 | .5 | -.1 | 39.6 |
| 1989 | 39.6 | .4 | .5 | .3 | 39.7 |
| 1990 | 39.7 | .2 | .5 | .3 | 39.7 |
| 1991 | 39.7 | .3 | .5 | 0 | 39.4 |
Table 5.4
