Year	current US$
1970	243268.643217623
1971	105930.328229504
1972	199703.674755441
1973	512035.186724375
1974	20741314.02554
1975	1867517.74044244
1976	906653.005747321
1977	3301306.24641216
1978	5377522.08986057
1979	10614162.0158284
1980	10173153.1324193
1981	7173941.84025928
1982	15058057.4001282
1983	14399314.7125184
1984	21591883.0139303
1985	24997088.4903926
1986	6475376.22501405
1987	11172086.0357662
1988	135578436.967969
1989	133546531.936879
1990	73782909.4508171
1991	13032553.2984339
1992	15029627.5302858
1993	4119677.20156638
1994	8250959.82501099
1995	2148887.27210234
1996	4727048.04515443
1997	2654815.47499551
1998	1350572.88551688
1999	1886813.08844715
2000	1487414.15497229
2001	665113.967320769
2002	13069716.4725178
2003	10455240.5021446
2004	14727819.5206957
2005	26115236.3861719
2006	67725370.2999636
2007	80608692.5131733
2008	48844166.8186794
2009	63043736.3673762
2010	78878467.6850666
2011	84316035.0286135
2012	111884169.788129
2013	68682057.1126886
2014	56315710.6390084
2015	33643774.8078166
2016	46124949.8172234
2017	105108.407567042
2018	10314.1742480155
2019	0
2020	0
2021	0