Year	constant 2015 US$
1960	6217.672193050615
1961	6889.459767928946
1962	7505.823239193568
1963	8154.2883117084
1964	8502.25180594455
1965	8936.345507137623
1966	9486.237694681316
1967	9776.908026860478
1968	10286.4973179873
1969	11092.864385791827
1970	11436.033118860316
1971	11824.392463580149
1972	12647.629495216464
1973	13482.882207754408
1974	14085.711075822186
1975	14009.7754794436
1976	14320.480438957566
1977	14576.195114660593
1978	14647.724612626555
1979	14525.192282773367
1980	14727.283522557045
1981	14603.590931016111
1982	14697.113641138167
1983	14884.57747255962
1984	15087.43895445696
1985	15381.844567023936
1986	15834.882867098748
1987	16669.977038505185
1988	17482.08698828715
1989	18297.244397175687
1990	18969.80864263921
1991	19403.330379680057
1992	19487.951211966163
1993	19187.182310353666
1994	19551.145294473143
1995	20001.790799896004
1996	20448.60148715736
1997	21117.018580829106
1998	21953.66751961403
1999	22846.717746028637
2000	23937.968551867485
2001	24707.367073686113
2002	25026.086471020688
2003	25310.45638741285
2004	25654.33655159235
2005	26145.80857861962
2006	26762.267255794195
2007	27218.449259735346
2008	27025.294943287056
2009	25778.95646506525
2010	25702.34684481489
2011	25402.605071746206
2012	24634.96208842388
2013	24368.96823709192
2014	24783.082946868533
2015	25754.361029439977
2016	26514.324811967927
2017	27239.35243648146
2018	27739.864768252937
2019	28087.897920343847
2020	24829.648591022185
2021	26391.597225156314
2022	27702.7452993409
2023	28046.95064442208