Year	current US$
1971	861508979.99778
1972	998593319.146838
1973	946244884.838922
1974	1183995740.2138
1975	1529145698.0697
1976	1410361872.14967
1977	1331477049.84063
1978	1541056389.54953
1979	1770012501.40885
1980	1856073159.14571
1981	2177125650.76745
1982	2297684681.05924
1983	2340257415.03931
1984	2507097108.65341
1985	2506371535.60675
1986	2730590261.89217
1987	2837219466.74438
1988	3406982214.10456
1989	3467597767.78175
1990	3567839246.91739
1991	3858506781.07388
1992	3343201858.89554
1993	3588195584.64453
1994	3991760571.54483
1995	4296232815.76158
1996	4449701890.34438
1997	4828940344.75502
1998	4749826299.83231
1999	4890975171.16393
2000	5331103146.03303
2001	5803619356.34218
2002	5824754764.94792
2003	6135087756.53895
2004	6978197874.36007
2005	7815729799.26507
2006	8714680310.44373
2007	9950558507.62867
2008	12095285997.3989
2009	12429093753.3651
2010	15340231214.0267
2011	20555291189.9482
2012	20770561652.6901
2013	21201525210.1138
2014	21952541176.7386
2015	23150029935.0999
2016	23058005657.092
2017	27458827145.2332
2018	31183733041.4046
2019	32139895213.5926
2020	31421276197.6102
2021	33841986561.9107