Year	current US$
1970	1668857.53754713
1971	801639.595386032
1972	871298.343903054
1973	1084836.55505354
1974	1349201.66107009
1975	1496753.82705718
1976	1239082.92699963
1977	1886715.07954309
1978	2117194.77358721
1979	2441606.26779078
1980	2976968.90730188
1981	3588374.39418696
1982	3816094.7379683
1983	3883222.19888313
1984	4136465.25803659
1985	4796644.83363058
1986	5078209.53888915
1987	5475361.22853228
1988	5927344.95508511
1989	6687033.2899047
1990	8093791.25442655
1991	7841521.34186855
1992	7924565.48791149
1993	8812399.29848775
1994	9150321.82599013
1995	9604496.70340766
1996	10423194.0147089
1997	11592210.3366629
1998	13760150.2261583
1999	15783484.400303
2000	14346682.450605
2001	19903631.0760284
2002	21712085.0591638
2003	23936490.9771415
2004	28744907.616749
2005	32874066.6415882
2006	39173316.4815528
2007	53238109.831061
2008	63583894.0142755
2009	78254376.646222
2010	102424457.278886
2011	119603837.436193
2012	130852693.520913
2013	135828366.224346
2014	133462064.386087
2015	121066487.371091
2016	132248319.434959
2017	139130584.99698
2018	144714737.781652
2019	149707421.806697
2020	144059024.796259
2021	149979332.793955