Year	constant 2015 US$
1960	421.1905693368588
1961	397.0869051754008
1962	414.3334368730803
1963	415.07634362462824
1964	379.7457306670781
1965	347.99263350780893
1966	369.911407578454
1967	381.8525857826796
1968	379.6091701428264
1969	363.5997806517812
1970	370.47759396842144
1971	368.746293319796
1972	412.82600218187457
1973	353.28273704470064
1974	347.01317486231466
1975	388.3623497893771
1976	371.9070728305493
1977	411.66229394114964
1978	405.6177215419303
1979	340.42180374810715
1980	318.0956726953364
1981	335.5890788196893
1982	343.8975100888888
1983	294.6452380819361
1984	293.4464433669449
1985	308.73008951410094
1986	289.9508654734935
1987	308.0775666007363
1988	318.48985635548013
1989	336.49496731793846
1990	346.10988732017216
1991	370.42076391198975
1992	355.0388129334729
1993	358.4672503221677
1994	280.1433206240771
1995	281.17814951821936
1996	293.16936358073644
1997	286.587104502423
1998	293.2342110230323
1999	302.3975353301961
2000	311.38391876902506
2001	320.6814673273354
2002	332.66783221084614
2003	345.3126065133946
2004	356.7385981462463
2005	369.32950286913825
2006	381.7010059702932
2007	395.05133441643346
2008	409.46271556491774
2009	426.25282874684837
2010	443.5713113714209
2011	465.8978821782064
2012	488.15662119407557
2013	459.70407434048144
2014	477.33956947540435
2015	507.48291546709765
2016	520.0699979048688
2017	547.6226591130078
2018	543.9775807413264
2019	543.6126170018019
2020	511.87980882648316
2021	512.4489259903919
2022	509.0750210018716
2023	509.0799895524479