Year	current US$
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	8072997.952334
1981	27250319.2233975
1982	21241827.2055563
1983	60322588.0283693
1984	67526113.8762342
1985	76271690.2668095
1986	24515416.5963787
1987	43994047.5400655
1988	23577631.5122341
1989	8226928.2702852
1990	9674852.47168011
1991	3469505.44703607
1992	19166016.542326
1993	21368162.0780748
1994	18415983.5835841
1995	20881203.1577129
1996	58601458.5398717
1997	49788593.949642
1998	18122765.2285643
1999	28445250.8884578
2000	46255618.0938995
2001	32519694.7612542
2002	72539637.6945725
2003	102006190.436263
2004	184746007.592629
2005	450937368.707666
2006	846173690.014204
2007	739282471.049326
2008	968119072.871232
2009	475342829.921594
2010	381054214.716657
2011	570227959.829286
2012	384363993.068056
2013	335222312.253715
2014	230021850.154859
2015	135373979.558099
2016	128352955.504744
2017	280351787.219289
2018	374980484.613438
2019	354857836.591017
2020	178640655.250996
2021	361261371.286345