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	1210092.58965634
1994	2716736.45943694
1995	2546527.28190979
1996	1992302.36100053
1997	823776.721298202
1998	958021.068654094
1999	1059328.12346853
2000	855457.805215353
2001	463349.282213422
2002	326885.735187124
2003	196304.682762338
2004	371988.663986195
2005	1373124.55916105
2006	2506469.11639836
2007	5005637.62782876
2008	4488345.87311857
2009	1083533.89307945
2010	9292225.1697267
2011	10703719.2150183
2012	12906945.8690193
2013	8664406.36986357
2014	8119800.54659133
2015	7668868.74687072
2016	7715964.46245173
2017	7583218.59348869
2018	8319723.74913892
2019	6045238.53381379
2020	6878584.40107387
2021	10607422.0180097