Table 5.3.—Value of the Resource, Additions, and Depletion of Other Minerals, Present Discounted Value Method Using 3% 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	16.1	0.2	0.1	0	16.1
1959	16.1	.2	.2	.4	16.5
1960	16.5	.1	.2	.6	17.1
1961	17.1	.2	.2	.7	18.0
1962	18.0	.3	.2	.6	18.7
1963	18.7	.3	.2	.4	19.2
1964	19.2	.5	.2	0	19.5
1965	19.5	.5	.2	.2	19.9
1966	19.9	.4	.3	.3	20.4
1967	20.4	.3	.3	.4	20.8
1968	20.8	.2	.3	-.9	19.9
1969	19.9	0	.3	-1.3	18.3
1970	18.3	.1	.2	-1.2	17.0
1971	17.0	.2	.2	-.8	16.2
1972	16.2	.2	.2	-.5	15.7
1973	15.7	.1	.2	1.5	17.1
1974	17.1	.3	.3	4.3	21.4
1975	21.4	.3	.4	6.0	27.4
1976	27.4	.4	.5	4.7	32.0
1977	32.0	.7	.6	2.2	34.3
1978	34.3	1.0	.6	1.1	35.8
1979	35.8	.6	.7	3.8	39.7
1980	39.7	-.3	.8	6.2	44.7
1981	44.7	-.4	.8	5.8	49.3
1982	49.3	-.7	.7	3.1	51.0
1983	51.0	-.8	.8	1.9	51.3
1984	51.3	-.7	.9	.9	50.6
1985	50.6	.6	.8	1.1	51.5
1986	51.5	.4	.7	.7	51.9
1987	51.9	0	.7	.2	51.3
1988	51.3	.1	.8	-.3	50.4
1989	50.4	.6	.8	.4	50.5
1990	50.5	.3	.8	.5	50.6
1991	50.6	.4	.8	0	50.2