Year	constant 2021 US$
1970	190249996.1853032
1971	140860000.6103517
1972	126180004.1198731
1973	184680007.93457067
1974	196300003.0517578
1975	252209999.08447298
1976	326300003.051758
1977	430059997.55859405
1978	264110000.610351
1979	215160003.66210932
1980	167610004.4250485
1981	266119995.11718696
1982	153720001.2207031
1983	175580005.6457522
1984	76209999.0844726
1985	136979999.5422363
1986	87369998.93188481
1987	75949998.14033507
1988	72970002.65121466
1989	63299996.37603757
1990	71290000.91552731
1991	95069999.69482419
1992	45309998.989105254
1993	111649997.7111817
1994	178920001.9836426
1995	109549999.2370606
1996	234509994.5068362
1997	172520004.2724614
1998	89049999.23706049
1999	86229999.5422363
2000	139000003.8146968
2001	215949996.94824198
2002	100509996.4141845