Year	current US$
1970	22825383.6459315
1971	18469900.7402137
1972	20833655.7423555
1973	35480424.3021898
1974	45521178.6994815
1975	26830402.5693976
1976	44071874.8437832
1977	41483516.7913343
1978	23189853.0523534
1979	57630025.1438796
1980	76170689.5715445
1981	48857037.4270891
1982	27625837.3499274
1983	35204673.130314
1984	29287202.6180423
1985	26971364.9043755
1986	16748470.4592792
1987	27341409.2730814
1988	117550038.759005
1989	106115557.5662
1990	53205750.52035
1991	84904695.909008
1992	52540492.8774083
1993	32696456.6178
1994	106741391.220298
1995	72805956.2968765
1996	90810251.6045387
1997	66493651.2329964
1998	40100259.5276967
1999	34540660.9011603
2000	38330457.3295317
2001	25484610.7455707
2002	79526198.7076845
2003	51573287.3147346
2004	91065077.7604084
2005	77626133.3081648
2006	198039218.576576
2007	251167372.733298
2008	74062375.4144436
2009	62412499.3261721
2010	203901214.449772
2011	324535821.250489
2012	255978094.411658
2013	220247623.198273
2014	223680591.198414
2015	123099152.105545
2016	141096284.000381
2017	229415756.396186
2018	445678169.61833
2019	419713798.806702
2020	360506263.467461
2021	850710358.617599