Year	constant 2015 US$
1970	1926.637409801579
1971	2001.9753458030411
1972	2126.215195292326
1973	2270.1008748410864
1974	2268.178040179505
1975	2274.1022765315092
1976	2444.8323018763326
1977	2606.0960547226578
1978	2768.49333993148
1979	2771.5744533691413
1980	2851.251912080966
1981	2781.4422877042584
1982	2745.2035947034838
1983	2661.3880051522515
1984	2664.074185436119
1985	2630.7548697446405
1986	2840.989991210978
1987	2747.1264887417187
1988	2847.1214073081514
1989	2787.324169515382
1990	2769.4610956737465
1991	2840.8762258246943
1992	2943.928612619766
1993	3088.2652899689997
1994	3405.451051896194
1995	3487.719763240054
1996	3438.310867602239
1997	3514.0351769798594
1998	3431.245737763871
1999	3149.2792899242763
2000	3091.1489190735365
2001	3109.216735600921
2002	3125.769807392654
2003	3157.479144437985
2004	3287.778253856737
2005	3417.5117864846643
2006	3585.2367563839175
2007	3851.546154146233
2008	3963.260540949502
2009	4089.03365624914
2010	4235.983272970245
2011	4392.544541712011
2012	4611.4062878426885
2013	4866.417879289628
2014	5077.792072695078
2015	5244.145101028979
2016	5322.195692856238
2017	5325.385812620822
2018	5324.872111021058
2019	5428.172200461898
2020	5062.931742250561
2021	5388.401689069979