Year	current US$
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	0
1989	0
1990	0
1991	0
1992	2817285.925578
1993	903071.568846876
1994	681881.347363671
1995	3690771.550704
1996	2701993.06340969
1997	2400668.19860495
1998	1065489.79992345
1999	3583044.92187648
2000	4370627.4869644
2001	3090865.563307
2002	6668102.50503906
2003	5866947.04410959
2004	10871019.2198076
2005	11461197.8759907
2006	28703680.9469512
2007	35273109.4014019
2008	34749429.8188924
2009	33249401.7623785
2010	90687932.7985951
2011	175274690.801148
2012	103169184.9914
2013	74527537.6928694
2014	42587842.0505532
2015	43092549.4286751
2016	55402534.573596
2017	43949183.1470407
2018	46887764.6388574
2019	68588789.80128
2020	96097499.4459252
2021	184491690.269429