Year	current US$
1970	4446.562910239916
1971	4757.609581620496
1972	5208.0029908357565
1973	5780.063648546753
1974	6083.07307863872
1975	6494.6041915844135
1976	7212.0655947936575
1977	7884.904525008604
1978	8753.225396566759
1979	9364.04970987778
1980	9984.694937649687
1981	11287.510436608081
1982	11832.754454469103
1983	12569.951337065488
1984	13973.37664684943
1985	14791.245579000944
1986	15450.755754492991
1987	16407.84569997663
1988	17887.081378078234
1989	18902.153243158205
1990	19638.17070347389
1991	20017.512765886066
1992	20753.938731210514
1993	21327.119372834346
1994	22403.018215398184
1995	23367.587709319203
1996	24504.919863349973
1997	25892.186247781327
1998	27149.577427296386
1999	28437.14634963729
2000	30015.464000606808
2001	30626.253939891467
2002	31234.9573794933
2003	32490.825517406676
2004	34602.383242516524
2005	36650.36856151548
2006	39078.507164577466
2007	40138.38831235753
2008	39936.6524970599
2009	38545.75350146353
2010	40891.39860825777
2011	42674.328963160275
2012	44594.242670209336
2013	45455.95433539476
2014	47036.77502221255
2015	47711.34897867334
2016	48038.88693104397
2017	50007.98866333012
2018	52233.26582797279
2019	53795.48324637342
2020	51933.54000934245
2021	57257.801794803396