Year	current US$
1974	27751850.13
1975	31729307.17
1976	26951189.04
1977	24015008.93
1978	42542655.94
1979	69104393.01
1980	90874862.67
1981	75515731.81
1982	69140495.3
1983	58598766.33
1984	51835803.99
1985	46899036.41
1986	57896789.55
1987	61124011.99
1988	67249015.81
1989	65609580.989999995
1990	79407991.6188852
1991	89434179.7814602
1992	95998440.1781453
1993	94115543.2580678
1994	59851799.2733389
1995	76350035.4252043
1996	67922656.4938612
1997	69784370.9629132
1998	66535946.9912401
1999	60841404.5995336
2000	55028951.0452428
2001	51317747.6470364
2002	39519211.9061367
2003	57218739.9054462
2004	76963915.9603781
2005	97769904.9493427
2006	96492204.0531888
2007	143429092.748697
2008	144686085.21357
2009	175124711.323493
2010	216655705.582328
2011	209403263.191383
2012	220998137.720918
2013	280522384.122023
2014	300414902.270835
2015	272324110.888509
2016	388583223.220912
2017	409389540.66878
2018	591757306.271898
2019	552837235.183161
2020	527488850.702635
2021	398853354.662113