Year	current US$
1970	1537790.86198491
1971	1220307.66466127
1972	1110341.73416451
1973	6558626.12210937
1974	9644954.17646769
1975	1724072.361138
1976	1846729.18429604
1977	1006054.45091233
1978	621381.678239184
1979	1712973.15748884
1980	766412.346578196
1981	464037.740750702
1982	939430.607183433
1983	355374.952623012
1984	25295.5231941203
1985	69386.4030034195
1986	0
1987	137729.878216572
1988	5834262.49888198
1989	8529709.82035687
1990	3207096.9058615
1991	1920815.90469564
1992	3956840.587979
1993	2354727.43352535
1994	1921139.89195412
1995	1242730.95648756
1996	1188343.98555948
1997	411491.58544574
1998	2565840.54413375
1999	1992536.12763474
2000	1558169.52670775
2001	1130309.11035488
2002	758026.710739408
2003	430926.154139343
2004	514963.190878445
2005	4234259.39881548
2006	7445436.85017004
2007	14520859.0585885
2008	18992003.2855178
2009	4480307.60889143
2010	18365339.6265942
2011	26963173.3004012
2012	22369022.5039774
2013	25687730.7457652
2014	14485287.5495306
2015	6208485.99495831
2016	8259695.49030838
2017	11415234.7283463
2018	0
2019	0
2020	0
2021	0