Year	current US$
1974	19966642.1680515
1975	28643661.5875451
1976	31479669.0931043
1977	36175501.6516758
1978	40491142.8625277
1979	47866572.4277948
1980	82178487.6566125
1981	90543500.7760934
1982	95353680.8611735
1983	106159991.60541
1984	116264949.848532
1985	127566741.764148
1986	139632172.94886
1987	153429196.090488
1988	161793619.199171
1989	172939047.088664
1990	175456049.996467
1991	176698359.014487
1992	165335304.47139
1993	173044414.298696
1994	179635652.958638
1995	209781447.237715
1996	223003289.375187
1997	240692582.166418
1998	263099193.494613
1999	278713674.354195
2000	286934579.874838
2001	287744694.493447
2002	295484353.996678
2003	310672729.916223
2004	358514534.625675
2005	372906680.783202
2006	426312155.432456
2007	490362121.110228
2008	495982380.904948
2009	451959001.746538
2010	482645067.816518
2011	505315539.010206
2012	502309840.988942
2013	492493666.575991
2014	497636124.611726
2015	514842968.841713
2016	533285180.611827
2017	543539181.526293
2018	549767683.119668
2019	581154198.151674
2020	548653344.096725
2021	568365509.380363