Year	current US$
1970	21637475.2814263
1971	13399672.7263197
1972	15570064.9945667
1973	43269308.8058021
1974	55392240.0984872
1975	18498855.2910505
1976	24568074.779882
1977	20437322.4188076
1978	13483613.2082089
1979	28358224.1540737
1980	35873700.9860251
1981	18179193.3102365
1982	11612854.5331949
1983	14230771.4461361
1984	7705050.36735032
1985	7772508.65009714
1986	4460326.73049216
1987	7539940.06136554
1988	27973702.05031
1989	77102433.5887828
1990	30672974.0685858
1991	39749377.3633157
1992	26426922.3377088
1993	10842424.0886714
1994	13045575.0073601
1995	15361867.7304419
1996	13128690.5268945
1997	24789834.6724211
1998	13644425.0430537
1999	19278201.2130806
2000	16886890.9514262
2001	199049.121301558
2002	10546377.9884279
2003	15688675.0530326
2004	39420433.175914
2005	56747381.5018554
2006	145881816.800854
2007	166128145.742787
2008	66191086.8483611
2009	52016002.6950435
2010	191545008.046454
2011	277070743.459529
2012	344097424.201347
2013	187340212.663428
2014	130818825.447471
2015	59665017.5371974
2016	57296333.8914012
2017	162476736.996829
2018	166922859.604735
2019	31720132.837215
2020	23396714.036067
2021	148633714.751527