Year	current US$
1970	2137.893208752367
1971	2331.7772914142815
1972	2722.30618231796
1973	3559.93521723547
1974	4481.946422893381
1975	5229.751761255285
1976	5605.9921767141295
1977	5796.104265800727
1978	6254.733547947008
1979	7740.970612949028
1980	9262.690468606967
1981	8941.341299379288
1982	8947.928038683714
1983	8545.406761749187
1984	8840.9729395628
1985	9305.61811921639
1986	12247.004455638864
1987	15131.77449426085
1988	17981.033995683134
1989	19230.1983818239
1990	22301.994414852426
1991	19436.166382284064
1992	16722.815043861534
1993	13110.861053307415
1994	15458.384598248542
1995	20756.432139346176
1996	20573.835345882868
1997	20045.582869475773
1998	21136.333602999748
1999	21508.94634911046
2000	20068.261909197638
2001	20702.81710929339
2002	22457.67490729047
2003	27056.452951433665
2004	31502.685400225164
2005	32328.401549712966
2006	34313.956944252175
2007	40174.25615874578
2008	44209.86342584625
2009	38788.56062771755
2010	38296.2127011865
2011	41789.9558751726
2012	38711.309785837235
2013	40439.56724799448
2014	41149.74787975601
2015	35093.91463971022
2016	35796.98257574041
2017	37839.34243894573
2018	40864.148368594106
2019	39659.4052411715
2020	40405.343874000435
2021	44416.200198939834