Year	constant 2015 US$
1960	2075.7798576169466
1961	2163.513354972367
1962	2288.092955967417
1963	2412.229872298127
1964	2517.646396154448
1965	3575.4625857880383
1966	3828.457999035516
1967	4100.304407369707
1968	4284.774495602621
1969	4561.340324147818
1970	4757.62040789326
1971	5038.154229842963
1972	5329.570350400805
1973	5678.979136051483
1974	5987.256518918229
1975	6321.183174175276
1976	6512.814617423004
1977	6975.307180854089
1978	7257.145858722963
1979	7439.629701181503
1980	7449.658121665708
1981	7662.701442361487
1982	7885.052610508133
1983	7954.00002686898
1984	8181.7763300989745
1985	8175.9250923605705
1986	8315.59393637145
1987	8667.008680038962
1988	8674.638005781198
1989	8834.201301026878
1990	8613.832217732834
1991	7589.901967999698
1992	7360.213656122393
1993	7326.160507302166
1994	7552.404674225391
1995	7675.578171089239
1996	7695.110537425036
1997	7952.98313173573
1998	8282.398859656507
1999	8560.969094411286
2000	8967.69626924063
2001	9354.480750901374
2002	9825.943198584031
2003	10255.610113160294
2004	10792.737427850574
2005	11278.61602555588
2006	11741.947676917776
2007	11792.771289739174
2008	11932.038399553541
2009	11162.055972274196
2010	11307.7161991209
2011	11551.498928934232
2012	11466.141909470407
2013	11705.009252356425
2014	12233.299367171994
2015	12717.038597002029
2016	13035.352859090897
2017	13628.404488570599
2018	14377.424160293891
2019	15083.599171874204
2020	14437.808848085235
2021	15521.381585225135
2022	16345.311087043163
2023	16286.759334728227