Year	current US$
1970	210305399.278778
1971	-9858185.17112756
1972	295923191.528342
1973	672109615.829327
1974	979315004.778416
1975	767769697.809022
1976	1282169094.63594
1977	2157578051.98047
1978	2494630388.51399
1979	2861253098.8832
1980	3572339759.26848
1981	2671172740.62519
1982	1806195616.35847
1983	1687082268.68684
1984	1857307548.05435
1985	2235149893.23054
1986	4211553607.73381
1987	4033520846.87929
1988	4806532163.81633
1989	4047909604.40195
1990	5086583373.5804
1991	6165768700.0912
1992	5289134849.83494
1993	5380931689.71762
1994	7396814538.54587
1995	7597110626.71853
1996	4179112643.91591
1997	2582323422.24321
1998	1053052667.79967
1999	681578236.848476
2000	1364017716.71773
2001	771558297.100252
2002	1912638673.98006
2003	3334385541.59352
2004	6011168414.71611
2005	10192611475.457
2006	12732111080.6893
2007	15786790509.1171
2008	20794274607.1087
2009	16366912991.0868
2010	20412780150.7394
2011	28356812650.9095
2012	26000795616.1751
2013	26051889904.2789
2014	26051713387.9759
2015	16830329671.857
2016	16629704631.486
2017	17719167747.0184
2018	18032599370.6794
2019	16469243303.9019
2020	10148566725.0703
2021	8827302906.23516