Year	current US$
1970	0
1971	0
1972	0
1973	357682.896793995
1974	1084679.6858155
1975	943545.009414965
1976	265738.986980047
1977	364585.937657964
1978	382891.355403857
1979	1044304.91176305
1980	2418239.48058144
1981	2014850.69084603
1982	2313951.67258898
1983	2666296.55449635
1984	2660032.64306942
1985	2789303.42109214
1986	5231241.61814135
1987	7298198.42691445
1988	7552169.70116449
1989	4319120.74505802
1990	4339012.4137096
1991	2037249.45746095
1992	1154087.54814942
1993	995434.839210429
1994	9080476.54194287
1995	8686708.7301103
1996	8455951.29539756
1997	7125667.41764011
1998	5586772.11380252
1999	5643629.52155801
2000	5853518.1115863
2001	5082735.84545707
2002	9211531.27051773
2003	7477455.50224703
2004	9744293.5626518
2005	10537193.1012929
2006	11004413.7911583
2007	5235656.28632577
2008	6196598.77771036
2009	10028814.5562982
2010	25410685.444115
2011	29535941.9757506
2012	29432555.1795958
2013	13449027.7153019
2014	10909111.361376
2015	9898357.41764227
2016	13028423.5704696
2017	13062558.8278792
2018	14441433.2586038
2019	13679529.8005073
2020	15846203.6248104
2021	37497793.5096172