Year	current US$
1970	0
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	0
2003	0
2004	0
2005	0
2006	0
2007	0
2008	0
2009	0
2010	0
2011	0
2012	488664.890380681
2013	272545.80125739
2014	193763.900460229
2015	227295.763104653
2016	62342.0877415217
2017	145065.848217295
2018	8890.77927400493
2019	32751.2754255317
2020	36924.0541738495
2021	58385.7713602088