Year	constant 2015 US$
1960	17776.551068472032
1961	18002.3895872158
1962	18091.225758171
1963	18817.608357436922
1964	19552.16731805778
1965	20407.725018270045
1966	21298.000159948755
1967	19960.994585404944
1968	19777.003601968794
1969	21599.071172151336
1970	21010.025505652484
1971	21482.05411301605
1972	22185.927371613507
1973	23452.9091323081
1974	24345.54023665193
1975	23463.026057046853
1976	23472.351089921438
1977	22478.3020515778
1978	22542.68018481405
1979	23127.130249964608
1980	23394.774612453628
1981	24389.862851524365
1982	24373.247341514078
1983	24883.592530099653
1984	25851.726241821387
1985	26107.48931354427
1986	26820.426670659093
1987	26848.632106228964
1988	26680.10989493336
1989	26595.194323687912
1990	26391.142588270082
1991	24868.738522874097
1992	24880.203708161192
1993	26170.440101481247
1994	27146.825667823054
1995	28015.58644254968
1996	28571.40750961577
1997	28785.195843652327
1998	28776.02221889281
1999	30164.085203497267
2000	30848.186088325572
2001	31713.130177231906
2002	32636.137550376698
2003	33511.55049133524
2004	34367.00623622035
2005	35120.73551264269
2006	35659.596165659954
2007	36406.14080587872
2008	35651.01563737061
2009	35278.04077636558
2010	35392.017344657004
2011	35910.417363657725
2012	36531.74844983269
2013	37252.75705504783
2014	38014.643552972775
2015	38639.350194142666
2016	39197.32752587104
2017	39691.213319671864
2018	40350.91220037444
2019	40651.97446731005
2020	39596.52661742209
2021	41225.7927835812
2022	42320.89243907601
2023	41724.968527083045