Year	current US$
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	50.9299098051751
1985	1091811.99160988
1986	558509.807849181
1987	791345.339186015
1988	683921.642336482
1989	666692.520686605
1990	4464362.1878339
1991	979132.440982326
1992	2500136.09777656
1993	2300368.78719854
1994	5325859.04472581
1995	6035665.5504869
1996	6403666.16416803
1997	7311443.88158384
1998	6881595.41563312
1999	5728378.16176195
2000	7171254.55434411
2001	7768527.2818462
2002	5852876.94028368
2003	6727760.42734236
2004	7522088.20311368
2005	7358216.31870285
2006	8745520.72319846
2007	7800316.09500996
2008	7506549.01685367
2009	8189683.98192258
2010	5856870.36849633
2011	7208523.19656975
2012	6376000.30705113
2013	5688885.8720463
2014	4322885.371355
2015	3330403.8142603
2016	1915436.1674624
2017	2149676.52705799
2018	3155204.38778632
2019	3364731.02788439
2020	6740524.83013194
2021	15907502.069815