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	4809.39732376472
1999	6507.72541273085
2000	9990.44432129517
2001	550.637927684752
2002	1534.8515443492
2003	2211.9184857676
2004	0
2005	0
2006	38763.6760225887
2007	40427.6108498676
2008	47590.8939907553
2009	57169.212400522
2010	0
2011	0
2012	0
2013	0
2014	0
2015	0
2016	0
2017	0
2018	0
2019	0
2020	0
2021	0