Year	current US$
1970	3298533.74020295
1971	1826594.7621791
1972	1668207.35365245
1973	3134303.95885133
1974	9044938.47562948
1975	3380744.9101113
1976	3785131.44844398
1977	3511983.9602842
1978	2693463.31048025
1979	5708645.98301407
1980	4334572.95865517
1981	2041370.05653524
1982	1750085.18917197
1983	2059735.60713726
1984	1368719.68198836
1985	1474609.05639456
1986	771929.810996945
1987	1666806.33361548
1988	11215733.3859785
1989	10285206.2236687
1990	4005328.2858001
1991	1384370.66725073
1992	1693104.58755085
1993	1508902.89795025
1994	2585032.97467242
1995	1139462.63288072
1996	1422019.54800253
1997	703963.315544278
1998	0
1999	0
2000	0
2001	0
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