Year	current US$
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	159537.517099179
1981	355456.729552445
1982	552846.652913514
1983	989329.446187653
1984	912758.171893332
1985	1031027.30432866
1986	654609.302688493
1987	626030.98602465
1988	751962.160981023
1989	985148.51092309
1990	942031.630015078
1991	934407.905735879
1992	711262.937431258
1993	597592.809651491
1994	628611.633246845
1995	990938.426570961
1996	919531.652529232
1997	660170.672287025
1998	529966.492381188
1999	334921.338864612
2000	457461.167536645
2001	825150.903386981
2002	606303.238762793
2003	714785.452196828
2004	2741953.69519535
2005	1672863.88149087
2006	1764526.94212622
2007	2434613.58652168
2008	5613970.55407623
2009	1967611.64241607
2010	5153341.22604073
2011	53637503.8178262
2012	119136275.618936
2013	301566815.851668
2014	202796623.166453
2015	54343974.3474819
2016	64670016.6822602
2017	89990272.3808493
2018	99173327.5403672
2019	59191399.5405191
2020	24252427.3411246
2021	36181663.2924848