Year	current US$
1970	26218059.5669046
1971	29192327.2736093
1972	29992543.1225938
1973	39188154.1008466
1974	47008801.9110673
1975	54227335.4886987
1976	54176975.185266
1977	66991762.9963414
1978	72103339.9703157
1979	81278924.6626161
1980	90075286.6540999
1981	71395578.3953478
1982	78924559.1615972
1983	60727048.2961029
1984	57662810.6063412
1985	51892978.2935521
1986	73195043.9322328
1987	73621734.6758157
1988	76764948.8254574
1989	82775072.1530389
1990	111997294.847692
1991	107458260.058866
1992	113247724.244909
1993	114399363.296518
1994	126027731.810816
1995	165368313.888399
1996	160150629.54753
1997	148676788.228884
1998	155190464.892459
1999	130297720.803576
2000	130802056.523704
2001	126651350.178676
2002	151447585.52963
2003	205793322.440051
2004	161148746.139409
2005	185848436.080346
2006	206717569.26674
2007	266210159.642109
2008	356614890.070962
2009	331320506.44123
2010	319002721.279308
2011	365256665.031162
2012	416840546.276997
2013	439641149.156909
2014	462159794.579689
2015	459213121.377227
2016	487417634.428204
2017	526373892.56387
2018	443000046.964412
2019	401262714.187628
2020	428388245.729135
2021	458784516.734902