Year	current US$
1970	12318145.3343187
1971	13245199.2030746
1972	20552140.3993346
1973	43231611.2624226
1974	43371041.0836135
1975	52069447.2865537
1976	58946863.5391438
1977	72765315.9645378
1978	70017200.9392423
1979	101182198.424422
1980	137608392.884872
1981	83304536.5792991
1982	126908956.597889
1983	117098932.790682
1984	80519995.8530138
1985	79218162.4554782
1986	114949231.061575
1987	144114653.807001
1988	136483952.788672
1989	145926196.429021
1990	137074925.006768
1991	148852530.747918
1992	165090758.894913
1993	203416994.295466
1994	246959361.526234
1995	278845722.617736
1996	283835465.554017
1997	229829960.767533
1998	205002788.322589
1999	154428453.696292
2000	127437493.412542
2001	121377107.420345
2002	147866306.089154
2003	211994723.614572
2004	168032228.192433
2005	173601037.280584
2006	247888666.744896
2007	343377084.895656
2008	464570494.890315
2009	401476591.493153
2010	551745207.727502
2011	567727797.646904
2012	518651664.158185
2013	532027975.872206
2014	731791083.59863
2015	524400310.85877
2016	536033986.519805
2017	680166860.65841
2018	556766342.694786
2019	512738717.387402
2020	534072848.843701
2021	520635407.523364