Year	current US$
1971	6664.4990829923
1972	8393.24374239624
1973	15491.7123625447
1974	118036.447323398
1975	799633.772134922
1976	930624.920534645
1977	2245596.94249051
1978	1648391.42910039
1979	208496220.309215
1980	101705122.28617
1981	44947169.2207222
1982	65065012.7552007
1983	95005543.3720744
1984	80179867.1847179
1985	57563798.3134105
1986	32183915.3544971
1987	23765450.037692
1988	22737143.6730361
1989	30059070.000126
1990	35933365.010582
1991	12998525.6035368
1992	37903460.6978438
1993	20895143.047168
1994	4386835.97913493
1995	7127402.49547212
1996	3294622.83980357
1997	1800830.30224409
1998	3343318.22787772
1999	1779513.9156931
2000	5285239.2197014
2001	11147964.040116
2002	89966879.426037
2003	152122165.322806
2004	209816543.006808
2005	329313076.971728
2006	303406690.207406
2007	415949404.052985
2008	686909312.442204
2009	480329937.709968
2010	672577453.642812
2011	902457399.286638
2012	659895453.069631
2013	541580440.592932
2014	640015907.204034
2015	405701077.562539
2016	406631900.188353
2017	476042291.760088
2018	705026531.896858
2019	632609819.492039
2020	427592514.985317
2021	742962339.44519