Year	constant 2015 US$
1970	8438.264986493266
1971	8715.698327133767
1972	9152.453045729748
1973	9568.540776637734
1974	9538.917567400922
1975	9676.674933655153
1976	10044.905363264137
1977	10298.542625413818
1978	10621.38760921031
1979	10900.225935297378
1980	10909.357486644316
1981	10963.767139582838
1982	11055.810611173465
1983	11362.113027132831
1984	11667.35162184978
1985	12037.928678929658
1986	12457.580430003027
1987	12845.647593551235
1988	13313.684679923193
1989	13692.377993153239
1990	13988.025273306595
1991	14044.483219125355
1992	14335.916569474439
1993	14518.729749240054
1994	14877.077457246585
1995	15184.057874292243
1996	15571.070498118936
1997	15957.613528022013
1998	16389.433240009603
1999	16975.564700967567
2000	17582.35720091253
2001	17935.19580238752
2002	18255.98991724867
2003	18597.39960959591
2004	19094.131709921578
2005	19589.896751455482
2006	20016.986864037102
2007	20460.891776596716
2008	20472.238277605094
2009	20054.077238047907
2010	20313.25975545987
2011	20520.357363122792
2012	20661.108314525674
2013	20860.609546283824
2014	21174.281109942956
2015	21523.060199416654
2016	21861.25283339384
2017	22299.04909637153
2018	22718.856045467586
2019	23015.814998453967
2020	21772.846688069523
2021	23171.90451463491
2022	23858.009743194303