Year	current US$
1970	24854825.2000341
1971	21527115.0587214
1972	16030957.4557332
1973	28020312.3193555
1974	32373758.4304636
1975	45975113.3813419
1976	41771258.2664143
1977	82481216.7536035
1978	89207222.9458704
1979	89700954.4773848
1980	110818117.864567
1981	105941371.38283
1982	151867047.705708
1983	87866959.0407543
1984	89324948.9595266
1985	71546359.2137707
1986	104156883.277952
1987	116143699.854445
1988	123527816.5532
1989	129541413.734592
1990	149436536.069085
1991	145006847.078302
1992	147256601.352497
1993	127776182.096615
1994	175052891.546841
1995	254852651.568809
1996	265469660.061405
1997	254348265.631888
1998	258977477.335961
1999	167039144.755066
2000	159429351.840371
2001	157085535.751778
2002	190313274.663529
2003	282377211.695579
2004	253627284.594425
2005	252451497.075715
2006	246677382.742538
2007	372577186.197124
2008	423687116.157589
2009	448672709.935165
2010	383690641.622945
2011	436803862.714907
2012	509849054.028946
2013	533438321.659532
2014	603765234.12542
2015	651182608.603721
2016	685813944.466353
2017	655853487.370783
2018	436479507.629545
2019	435782762.096414
2020	487068344.410182
2021	516326002.520786