Year	constant 2021 US$
1960	280989990.234375
1961	207990005.493164
1962	146449996.94824198
1963	108839996.337891
1964	42869998.9318848
1965	61110000.6103516
1966	13140000.3433228
1967	10300000.1907349
1968	6150000.09536743
1969	24510000.2288818
1970	43349998.4741211
1971	37650001.5258789
1972	43830001.8310547
1973	41049999.237060495
1974	100569999.69482401
1975	126589996.337891
1976	218850006.10351598
1977	337200012.207031
1978	152589996.33789098
1979	84919998.1689453
1980	135449996.94824198
1981	123559997.558594
1982	83930000.3051758
1983	50270000.4577637
1984	46200000.762939505
1985	92110000.6103516
1986	76610000.6103516
1987	82790000.9155273
1988	82029998.7792969
1989	75980003.3569336
1990	66540000.9155273
1991	65900001.525878906
1992	41439998.626709
1993	54479999.5422363
1994	68559997.55859381
1995	30459999.084472697
1996	33090000.152587898