Year	constant 2015 US$
1970	4074.5660671842443
1971	4307.727381439416
1972	4509.817126513795
1973	4808.107955733803
1974	5018.052322277686
1975	5100.7658880262325
1976	5233.708509529007
1977	5343.360328979935
1978	5422.299773139369
1979	5689.46839835246
1980	5925.621968849123
1981	5810.758332774938
1982	5595.5444276224935
1983	5359.263163562895
1984	5466.605726555784
1985	5550.770085666027
1986	5636.972059057239
1987	5735.073471585231
1988	5650.711438948856
1989	5830.939697423289
1990	5530.460499163794
1991	5619.246874514049
1992	5657.534008810749
1993	5804.5325800267065
1994	5974.190256058096
1995	5928.266794706388
1996	6065.696666185039
1997	6291.886347827743
1998	6353.9543860103
1999	6266.350775575647
2000	6395.891209790815
2001	6316.298578565707
2002	6240.957915311858
2003	6312.112996153259
2004	6508.223933967487
2005	6675.983931112057
2006	7022.137296131992
2007	7326.680111683091
2008	7516.796444670805
2009	7254.9529613846225
2010	7627.706436588141
2011	7883.7020777498865
2012	7982.260314792218
2013	8142.077848848789
2014	8161.813591017987
2015	8115.210714221322
2016	7978.010472736507
2017	8049.337008429386
2018	8038.945965778077
2019	8009.528399897013
2020	7459.191272750242
2021	7876.052571656143
2022	8142.22058753835
2023	8261.986619266647