Year	constant 2015 US$
1974	5085.6883863191
1975	4939.206956191161
1976	5482.667851742026
1977	5870.765007179647
1978	6130.636354154574
1979	6644.002546282927
1980	6573.250538665303
1981	6256.575851861536
1982	6173.481198722755
1983	6156.594922990296
1984	6356.655050705953
1985	6365.012914347142
1986	6460.765906343839
1987	6662.789093066737
1988	6824.387110344552
1989	6951.97433310731
1990	7050.102033793393
1991	6965.590136100677
1992	6891.1044471152445
1993	6988.407093581591
1994	7121.97975131231
1995	7360.245856880002
1996	7551.264640289123
1997	7756.749440874195
1998	7978.416539619049
1999	8106.412661270746
2000	8460.369383575426
2001	8578.285717324905
2002	8731.968020514294
2003	8954.426893650287
2004	9228.692595210674
2005	9506.453351932323
2006	9916.245334783784
2007	10309.456812938235
2008	10342.663230038315
2009	9867.951861165318
2010	9993.071189750288
2011	10182.482923504138
2012	10256.570339824837
2013	10288.605515163563
2014	10401.117327805017
2015	10568.240699750648
2016	10783.526691877252
2017	11103.839515694835
2018	11376.32498756562
2019	11644.293571256243
2020	10805.879892157165
2021	11452.192813703019
2022	12203.981009180225
2023	12626.818669652543