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	5828725.45142663
1998	1591108.94794549
1999	2603090.16509234
2000	3107028.1839228
2001	1146978.80336734
2002	3190956.36070199
2003	3826618.98037795
2004	9791003.71040899
2005	15857756.2799775
2006	23258205.6135532
2007	22801172.5193253
2008	20768666.1375656
2009	24948644.2915878
2010	27813801.0241219
2011	37642329.7104218
2012	38076582.7539422
2013	27228269.8007193
2014	17298342.8653893
2015	10257414.7713037
2016	10738559.8286509
2017	10233137.4869843
2018	4078193.0792844
2019	0
2020	0
2021	5605341.85192125