Year	current US$
1970	10256233.1300479
1971	6058290.07138301
1972	5026129.99431687
1973	10213617.0939152
1974	9800756.94516363
1975	2771998.3697928
1976	2869483.82888517
1977	1482327.89630404
1978	612673.390815162
1979	338640.095223942
1980	358071.119960153
1981	236537.444556129
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	0
1998	11199.700007237
1999	4576.93940228219
2000	84342.8092743181
2001	0
2002	7574.83711105596
2003	4614.06661911859
2004	1259292.89212681
2005	2374999.66800529
2006	6219059.22287203
2007	7033025.05092344
2008	8477803.33932668
2009	3419.00996311444
2010	170286.747938833
2011	44646.887801697
2012	106843.034323944
2013	29892741.9713359
2014	24652220.0436756
2015	18413451.9866196
2016	23666787.6867669
2017	11510853.1441308
2018	0
2019	0
2020	0
2021	0