Year	current US$
1970	2408.9542125243834
1971	2689.6992534375627
1972	3347.155610889141
1973	4303.5704257010675
1974	5019.883324982709
1975	5871.784155844491
1976	6389.577483848897
1977	7358.972851862761
1978	8975.478712025406
1979	10239.078822427276
1980	10883.394724215716
1981	8911.375434528169
1982	7799.440501765175
1983	7382.650522139613
1984	7119.162823483071
1985	7401.877396846326
1986	10345.014259074818
1987	12939.767731816692
1988	14090.041851421338
1989	14168.789978067452
1990	17687.37226551935
1991	18087.65476582405
1992	20048.89092891909
1993	19260.13286814098
1994	21122.53917652037
1995	24603.410616739526
1996	23714.323954278763
1997	21429.06745178532
1998	21830.119661699766
1999	21654.6247058331
2000	19849.086331872306
2001	19540.07128005292
2002	21180.862369108814
2003	25875.245727052556
2004	29772.014083437825
2005	30809.48264480513
2006	32327.93156020445
2007	36972.48912431313
2008	40409.15791092228
2009	36866.04910990041
2010	36326.63932588059
2011	38266.983742104916
2012	36945.84099924633
2013	38766.038043621134
2014	39529.63106378199
2015	33799.739833793734
2016	34528.49059494007
2017	36341.191073741924
2018	39046.70140853767
2019	38340.12199912438
2020	36801.28174181392
2021	41743.01428049657