Year	current US$
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	0
1993	0
1994	0
1995	0
1996	0
1997	0
1998	0
1999	0
2000	0
2001	0
2002	2827093.58730489
2003	4067063.68150124
2004	7072806.66060776
2005	16412097.2062937
2006	24764330.1497468
2007	36727846.7334896
2008	41847154.6454129
2009	10389025.9427227
2010	0
2011	0
2012	26111470.4907643
2013	25014697.5684794
2014	22923321.2794536
2015	9599630.09717278
2016	7795049.60214203
2017	2889952.63350539
2018	4547073.44215067
2019	3394992.30132517
2020	1722691.22834633
2021	4855931.71780001