Table 3.1.—Value of the Resource, Additions, and Depletion of
Coal, Current Rent Method I (Rate of Return)
[Billions of current dollars]
| Year
| Opening stock
| Additions
| Depletion
| Revaluation adjustment
| Closing stock (1+2-3+4)
|
| (1) |
(2) | (3) | (4) | (5) |
| 1958 | 9.8 | 0.2 | 0.2 | -0.1 | 9.7 |
| 1959 | 9.7 | .2 | .3 | 1.8 | 11.5 |
| 1960 | 11.5 | .1 | .3 | 1.2 | 12.5 |
| 1961 | 12.5 | .4 | .3 | .4 | 13.0 |
| 1962 | 13.0 | .5 | .4 | 1.3 | 14.4 |
| 1963 | 14.4 | .7 | .4 | 1.7 | 16.3 |
| 1964 | 16.3 | .7 | .4 | -.5 | 16.2 |
| 1965 | 16.2 | .7 | .4 | -.4 | 16.0 |
| 1966 | 16.0 | .6 | .4 | -.8 | 15.3 |
| 1967 | 15.3 | .5 | .4 | -1.3 | 14.1 |
| 1968 | 14.1 | .5 | .4 | -1.3 | 13.0 |
| 1969 | 13.0 | .4 | .3 | 0 | 13.1 |
| 1970 | 13.1 | .5 | .4 | 2.5 | 15.6 |
| 1971 | 15.6 | .5 | .4 | -.3 | 15.3 |
| 1972 | 15.3 | .5 | .5 | 1.4 | 16.8 |
| 1973 | 16.8 | .6 | .5 | 8.0 | 24.9 |
| 1974 | 24.9 | 1.5 | 1.0 | 16.5 | 41.9 |
| 1975 | 41.9 | 2.3 | 1.7 | 18.9 | 61.5 |
| 1976 | 61.5 | 3.0 | 2.4 | 13.0 | 75.1 |
| 1977 | 75.1 | 4.2 | 2.5 | .7 | 77.5 |
| 1978 | 77.5 | .6 | 2.1 | -9.9 | 66.2 |
| 1979 | 66.2 | 11.8 | 2.6 | 7.9 | 83.3 |
| 1980 | 83.3 | 6.9 | 3.0 | 4.9 | 92.2 |
| 1981 | 92.2 | 2.4 | 3.0 | .4 | 91.9 |
| 1982 | 91.9 | 5.9 | 3.3 | 5.9 | 100.4 |
| 1983 | 100.4 | .1 | 3.4 | 6.1 | 103.2 |
| 1984 | 103.2 | 6.1 | 4.8 | 22.4 | 127.0 |
| 1985 | 127.0 | 7.7 | 4.9 | 4.6 | 134.4 |
| 1986 | 134.4 | 7.5 | 5.1 | 4.0 | 140.7 |
| 1987 | 140.7 | 4.4 | 5.4 | 3.2 | 143.0 |
| 1988 | 143.0 | 5.8 | 5.3 | -5.2 | 138.3 |
| 1989 | 138.3 | 4.5 | 5.3 | -2.5 | 134.9 |
| 1990 | 134.9 | 7.0 | 5.6 | 1.2 | 137.5 |
| 1991 | 137.5 | 4.6 | 5.3 | -2.4 | 134.4 |
Table 3.2
