Year	current US$
1970	0
1971	0
1972	0
1973	0
1974	9072767.86151718
1975	10097026.3505187
1976	3404844.60434976
1977	10941406.2820429
1978	247846.253880833
1979	638636.283597687
1980	5204967.83386168
1981	8329480.18864492
1982	4950422.55048913
1983	3501751.82497585
1984	0
1985	1682309.38662456
1986	0
1987	0
1988	0
1989	0
1990	0
1991	0
1992	0
1993	0
1994	0
1995	0
1996	0
1997	0
1998	0
1999	0
2000	0
2001	0
2002	0
2003	0
2004	0
2005	0
2006	8673258.29242162
2007	18240836.8518231
2008	136875297.629735
2009	84935918.25365
2010	48954023.7819401
2011	125787065.148546
2012	114257541.074534
2013	45225413.1732703
2014	59202653.151774
2015	93251892.8384497
2016	69050737.0936525
2017	59187013.7512919
2018	61165448.9418275
2019	0
2020	0
2021	0