Year	constant 2015 US$
1970	946.2465852369282
1971	1047.7904477028792
1972	1074.8570823078983
1973	1139.7226234887535
1974	1171.177772549127
1975	1295.0302272897907
1976	1229.1735316693366
1977	1202.959414340571
1978	1179.9611987627352
1979	1177.0091607125166
1980	1280.47724272024
1981	1425.9206295667648
1982	1401.1898904295067
1983	1372.4656278411453
1984	1410.1411170068657
1985	1411.3238874279489
1986	1524.1982796971101
1987	1681.166818232674
1988	1710.9588488519967
1989	1858.1434203851036
1990	2174.8061358764185
1991	2124.287387447107
1992	2108.7907762591617
1993	2109.787567931699
1994	2159.789192222657
1995	2264.4024685456234
1996	2303.06432203972
1997	2333.4271606856814
1998	2359.8339305481204
1999	2397.9505382840293
2000	2411.444924149839
2001	2411.373859114683
2002	2494.4475396383464
2003	2571.6880711289286
2004	2647.463243442735
2005	2790.2507884621773
2006	2941.3968419108755
2007	3054.082429197766
2008	3062.6149912493524
2009	3096.2960692465163
2010	3199.0535421557584
2011	3254.8133725964462
2012	3411.7193609008123
2013	3521.6693370060966
2014	3530.3609038952095
2015	3583.3112903134265
2016	3594.1670669325517
2017	3638.7687820201336
2018	3696.3598501209235
2019	3766.0629993515768
2020	3672.6533498756253
2021	4025.423829799597
2022	4012.940449617434
2023	4175.459321193588