Year	current US$
1970	3990000.0449270047
1971	7050000.140443437
1972	7399999.998509884
1973	17999999.964609794
1974	19690000.249072902
1975	20350000.1113862
1976	21939999.794587526
1977	19779999.542981356
1978	10589999.830350278
1979	34860000.72956088
1980	55729999.83094626
1981	29650000.715628263
1982	33469999.07307326
1983	24030000.41469932
1984	17199999.92661178
1985	17680000.042542808
1986	20210000.360384613
1987	37389999.900013186
1988	27010000.031441435
1989	16839999.67388812
1990	13870000.21710992
1991	50920001.527294494
1992	44229999.50312075
1993	50989999.74876642
1994	50130001.617595576
1995	33730000.261217326
1996	49450000.580400184
1997	21420000.407844786
1998	31719999.762251984
1999	23740000.4044175
2000	60800000.695511654
2001	29860000.101849444
2002	26610000.703483816
2003	26699999.565258577
2004	27080000.160262004
2005	39469999.982044056
2006	52860000.46506524
2007	31139999.631792247
2008	45339999.89926821
2009	37959999.22603369
2010	24159999.484196357
2011	30709999.520331584
2012	32470000.490546264
2013	37320000.13999639
2014	37729999.998584345
2015	17680000.10401015
2016	15129999.898374123
2017	13830000.184476418
2018	45769999.07009305
2019	29780000.364407934
2020	19109999.56727028
2021	21249999.519437548
2022	12890000.017359843