Year	current US$
1970	45587391.7339716
1971	37675172.8061213
1972	46581222.5810807
1973	52043246.0562264
1974	54640652.7094681
1975	59482576.8699525
1976	57722466.4286751
1977	65984320.4575991
1978	71447501.5458331
1979	107445224.776675
1980	142978236.458279
1981	236742589.079467
1982	262067743.103894
1983	278958005.33013
1984	317059923.355741
1985	361925111.199525
1986	502599718.754536
1987	639815758.927391
1988	788825517.21045
1989	857440670.217029
1990	894988090.164575
1991	1291630252.1699
1992	1139855053.95659
1993	1873403461.45322
1994	2292158455.87746
1995	3061726495.021
1996	3723623775.28301
1997	4035257154.65394
1998	269285385.325291
1999	294864576.806134
2000	263601951.927597
2001	261729225.026117
2002	240066790.694076
2003	206982353.275803
2004	174604287.963953
2005	158459486.889561
2006	122132737.997805
2007	93100388.3882763
2008	42677619.0515497
2009	204679454.819554
2010	211524143.368
2011	239043316.981
2012	291196353.458
2013	328918662.649
2014	330438255.593
2015	336253198.641
2016	343849512.357
2017	297840720.256792
2018	638759370.41362
2019	410417676.08557
2020	401703465.437254
2021	528539985.990914