Year	constant 2015 US$
1970	8683.408502569953
1971	9070.351614822714
1972	9469.423265107309
1973	9898.525649600033
1974	10065.341031369671
1975	10242.671596993037
1976	10684.706916203899
1977	10996.526110321394
1978	11283.098146038034
1979	11661.07132365289
1980	11871.873271343035
1981	11882.94532760049
1982	11939.086608917078
1983	12023.197965511108
1984	12159.53383057479
1985	12394.664975545296
1986	12800.09891130747
1987	13226.09659296792
1988	13645.323436773493
1989	14088.110757546434
1990	14476.623607607553
1991	14798.576900168113
1992	15029.365969875631
1993	14853.708868391132
1994	15045.96413767127
1995	15277.0739213603
1996	15559.051040497887
1997	15836.030636897076
1998	16316.001706286608
1999	16818.035291152766
2000	17259.452245584856
2001	17523.408909593207
2002	17581.268170986772
2003	17695.580810230633
2004	17910.420563131767
2005	18174.18771820525
2006	18461.000892902284
2007	18703.205454445404
2008	18663.33258234766
2009	18388.883887623808
2010	18509.288468600556
2011	18579.83080670351
2012	18351.30164089166
2013	18170.21954131848
2014	18266.02061644789
2015	18552.649589774606
2016	18872.089810464728
2017	19174.24206814502
2018	19416.635193068803
2019	19657.88302957359
2020	18112.536921064697
2021	18914.114488906023
2022	19627.811249402977
2023	19610.157538141753