Table 3.4.—Value of the Resource, Additions, and Depletion of
Coal, 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 | 14.3 | 0.2 | 0.3 | -0.1 | 14.1 |
| 1959 | 14.1 | .2 | .3 | .5 | 14.6 |
| 1960 | 14.6 | .1 | .3 | .4 | 14.9 |
| 1961 | 14.9 | .4 | .3 | .3 | 15.3 |
| 1962 | 15.3 | .5 | .3 | .3 | 15.8 |
| 1963 | 15.8 | .5 | .4 | .4 | 16.4 |
| 1964 | 16.4 | .6 | .4 | -.6 | 16.0 |
| 1965 | 16.0 | .6 | .4 | -.5 | 15.7 |
| 1966 | 15.7 | .5 | .4 | -.5 | 15.3 |
| 1967 | 15.3 | .5 | .4 | -.5 | 14.9 |
| 1968 | 14.9 | .5 | .3 | 0 | 15.0 |
| 1969 | 15.0 | .4 | .4 | .7 | 15.7 |
| 1970 | 15.7 | .5 | .4 | 1.7 | 17.5 |
| 1971 | 17.5 | .5 | .4 | 2.0 | 19.6 |
| 1972 | 19.6 | .6 | .5 | 1.8 | 21.5 |
| 1973 | 21.5 | .8 | .6 | 7.0 | 28.7 |
| 1974 | 28.7 | 1.6 | .9 | 13.1 | 42.4 |
| 1975 | 42.4 | 2.2 | 1.4 | 15.8 | 59.0 |
| 1976 | 59.0 | 2.7 | 1.9 | 12.2 | 72.1 |
| 1977 | 72.1 | 4.0 | 2.2 | 7.2 | 81.1 |
| 1978 | 81.1 | .7 | 2.2 | 3.7 | 83.4 |
| 1979 | 83.4 | 13.3 | 2.7 | 8.1 | 102.0 |
| 1980 | 102.0 | 7.9 | 3.1 | 8.4 | 115.2 |
| 1981 | 115.2 | 2.8 | 3.4 | 6.9 | 121.6 |
| 1982 | 121.6 | 6.8 | 3.7 | 5.0 | 129.8 |
| 1983 | 129.8 | .1 | 3.6 | 5.1 | 131.4 |
| 1984 | 131.4 | 5.7 | 4.3 | 2.9 | 135.7 |
| 1985 | 135.7 | 6.9 | 4.3 | 1.6 | 139.9 |
| 1986 | 139.9 | 6.5 | 4.4 | 1.0 | 143.1 |
| 1987 | 143.1 | 3.7 | 4.5 | -.7 | 141.6 |
| 1988 | 141.6 | 4.9 | 4.5 | -4.5 | 137.5 |
| 1989 | 137.5 | 3.8 | 4.5 | -3.4 | 133.4 |
| 1990 | 133.4 | 5.8 | 4.6 | -1.5 | 133.1 |
| 1991 | 133.1 | 3.9 | 4.4 | -1.0 | 131.5 |
Table 3.3
