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	828346.982327406
1993	253835.658985756
1994	1890792.76252066
1995	3794593.39773593
1996	3313617.62854076
1997	3265828.46353247
1998	2371425.11319474
1999	3794158.31978289
2000	4002345.52454552
2001	3319416.29825291
2002	7946919.7937734
2003	6192937.13805086
2004	5848213.87877314
2005	5057441.63742016
2006	10261469.9244257
2007	12547717.9919979
2008	15214130.1966424
2009	16044336.9503061
2010	44459994.012085
2011	73020331.0186722
2012	71361375.1340308
2013	59442183.5455668
2014	76592880.168516
2015	78630894.6603293
2016	130444146.079635
2017	130769929.78395
2018	173061038.622652
2019	239006856.890949
2020	227295854.966617
2021	474745373.311037