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	81980000.49591061
1991	302249996.66214013
1992	524939996.24252295
1993	394359992.9809572
1994	533310005.18798816
1995	607380001.0681161
1996	644439994.8120128
1997	682760002.1362312
1998	815180000.3051767
1999	1101389995.5749514
2000	829789989.4714355
2001	1080040008.5449226
2002	798319986.3433837
2003	1041449991.226196
2004	1043219999.7901919