Year	current US$
1970	6889702.49331606
1971	6252988.87748525
1972	7361020.66448022
1973	12801791.6651376
1974	14211230.3522204
1975	20787588.6838571
1976	17985625.1220717
1977	28382918.753004
1978	30339540.6165303
1979	40396020.1094754
1980	37617740.4224655
1981	37405215.4266175
1982	69035330.4128031
1983	28639013.3884326
1984	19891283.3930779
1985	14765607.0448162
1986	22575579.4394494
1987	29612469.6240834
1988	29423194.5301652
1989	33004121.7798971
1990	56392320.0056553
1991	61380225.3977956
1992	67587387.1434589
1993	66354845.0641161
1994	65632144.7465443
1995	86554971.2623732
1996	78256466.231805
1997	88744989.2606723
1998	81095713.924207
1999	68810039.4806634
2000	39898847.6247873
2001	10955466.5672622
2002	0
2003	0
2004	0
2005	0
2006	0
2007	0
2008	0
2009	0
2010	0
2011	0
2012	0
2013	0
2014	0
2015	0
2016	0
2017	0
2018	0
2019	0
2020	0
2021	0