Year	current US$
1976	41115066.466719106
1977	28180764.33310312
1978	25998799.381306708
1979	28372065.2328881
1980	36284843.20664907
1981	73692872.5017226
1982	82183083.0293175
1983	61573470.407918
1984	50123204.497274294
1985	47651557.4131209
1986	57220581.7522928
1987	84080313.5094148
1988	99030001.3514063
1989	147894034.2511687
1990	198121438.43005714
1991	266812629.655698
1992	329198420.286937
1993	306699893.728906
1994	235441718.548271
1995	321338206.83614
1996	432151545.771474
1997	396925752.765305
1998	318034112.953652
1999	247534048.856224
2000	242662475.157798
2001	285126754.93001
2002	163083597.230216
2003	219299337.5846374
2004	181185127.54195398
2005	285536401.4292133
2006	297595427.25046974
2007	320676419.3275069
2008	312100054.4772058
2009	160104633.1872139
2010	278114967.01877517
2011	385192229.9403664
2012	431639269.2754671
2013	383216848.96344125
2014	177630669.19282
2015	108803966.52690908
2016	91698168.4107274
2017	253705989.19758952
2018	267104122.41576272
2019	263004381.9163133
2020	96125488.14089046
2021	172021728.021