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	113041072.994436
1993	39506750.3249463
1994	23460843.1771606
1995	10702915.0301794
1996	5803142.73469236
1997	2196179.83565863
1998	10377526.7861722
1999	0
2000	0
2001	590835.395591768
2002	0
2003	0
2004	2732075.94244993
2005	65135077.8149031
2006	114997844.831994
2007	382549547.080351
2008	378809039.852846
2009	62291506.9957622
2010	1329342919.13269
2011	1506798901.82853
2012	752401257.691306
2013	854865248.761771
2014	407057566.333754
2015	4783763.83652436
2016	148626086.375484
2017	70906810.6373551
2018	131024548.213714
2019	8765775.61868739
2020	57552562.256947
2021	3399555028.20659