Year	current US$
1970	19494631.8138395
1971	17688925.290142
1972	20479149.3607318
1973	28382986.5512789
1974	32214587.7731493
1975	55026977.8687245
1976	51128738.2846825
1977	69419635.411744
1978	71914330.4949727
1979	71003796.7882664
1980	90015494.9320472
1981	79487072.7479758
1982	106217156.882151
1983	70719563.8063852
1984	64270476.4779752
1985	50234895.0901964
1986	81442039.9948769
1987	84018118.8834716
1988	94938038.7756957
1989	128485509.699864
1990	165220533.49511
1991	156865129.525375
1992	162935096.029636
1993	143992363.802992
1994	161211193.466739
1995	255093299.860129
1996	241926819.448
1997	220482847.120604
1998	225400751.378337
1999	175520803.159923
2000	174901715.138403
2001	168835908.675985
2002	201296341.411769
2003	275301366.029467
2004	218856586.275603
2005	245587617.914104
2006	266473773.122113
2007	347771495.947738
2008	454039267.667927
2009	431777182.884354
2010	409278880.72383
2011	463928194.212156
2012	525691416.508395
2013	548772941.041868
2014	573021990.988133
2015	562442622.432365
2016	592037038.920045
2017	623999378.338994
2018	512730019.521116
2019	466446250.147202
2020	497989415.793898
2021	530351177.608404