Year	constant 2015 US$
1970	10880.266508377688
1971	11173.926182327818
1972	11802.480456889998
1973	12443.967882055527
1974	12884.639970074782
1975	13182.89014676967
1976	13677.737135719077
1977	13894.307874045717
1978	14167.09345079083
1979	14348.620640969462
1980	14406.613431986556
1981	14400.385192613747
1982	13865.12917994492
1983	14071.337717476215
1984	14474.427572490467
1985	15045.417999477353
1986	15406.144397927344
1987	15793.723743320645
1988	16233.299861118316
1989	16488.39780458273
1990	16464.33936350803
1991	16079.997312128695
1992	16135.85521437573
1993	16256.012717073281
1994	16543.913464715635
1995	16741.0688680116
1996	17058.850663207948
1997	17715.903207548483
1998	18050.433702233036
1999	18608.98843168367
2000	19185.796789698972
2001	19434.78490573962
2002	19993.8672003615
2003	20358.636543182052
2004	20787.135596035798
2005	21399.93730132512
2006	22073.34030866235
2007	22824.8226014001
2008	23254.078275677453
2009	23008.940842905035
2010	23570.576526934874
2011	23873.395693697283
2012	24063.874788907407
2013	24437.452449845216
2014	24817.69895265384
2015	25201.35418322399
2016	25442.13849696141
2017	26064.83907240156
2018	26372.6989765709
2019	26401.670777664793
2020	24482.677010117248
2021	25592.735405627118
2022	26410.648888297008
2023	26087.646554535524