Year	current US$
1970	0
1971	0
1972	0
1973	0
1974	590017.096554942
1975	0
1976	0
1977	7194944.68799666
1978	8602907.69989352
1979	14331187.4260921
1980	13632118.4862505
1981	4136277.86520196
1982	2192826.81703945
1983	7951502.71611826
1984	2629255.5277888
1985	0
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	0
2007	0
2008	0
2009	0
2010	0
2011	0
2012	0
2013	0
2014	0
2015	0
2016	6197.52768523337
2017	0
2018	0
2019	0
2020	0
2021	0