Year	current US$
1970	9152841.82674345
1971	10070651.4893129
1972	11718162.577013
1973	14562607.0403513
1974	17915862.090156
1975	23352208.8507339
1976	27293081.5451077
1977	30657625.3068364
1978	31306103.5387957
1979	36730038.4059266
1980	45489332.9503732
1981	47502535.211385
1982	49969134.1650659
1983	56684005.9282461
1984	53292014.3537661
1985	59628312.9679514
1986	66549115.4462543
1987	72092737.6721272
1988	77671116.0809257
1989	76493786.649047
1990	79064652.6349375
1991	114471903.33069
1992	121489597.081615
1993	105513696.609238
1994	107467901.876565
1995	130845960.08466
1996	137609987.072168
1997	135824231.581835
1998	132063987.248693
1999	128154613.353448
2000	106770766.484895
2001	107981647.210835
2002	123879239.41022
2003	142486238.505449
2004	171579409.327134
2005	189961881.343287
2006	243051900.603064
2007	263333200.848325
2008	283788523.149069
2009	273872330.388432
2010	360045307.974156
2011	419305312.69741
2012	450641144.508359
2013	475876542.947478
2014	471907224.094101
2015	464060450.488241
2016	468500284.171916
2017	506421440.244555
2018	569664634.390256
2019	592911210.013698
2020	637913454.529109
2021	740954478.621055