Year	constant 2015 US$
1970	27868.075544761
1971	29042.067405883394
1972	30388.637095106333
1973	30997.866674188117
1974	30681.48425744229
1975	29797.64740748578
1976	30288.004816996112
1977	31311.716151815956
1978	32003.97433016418
1979	32346.76192499317
1980	33065.02418672451
1981	33201.31328796883
1982	33091.10398862329
1983	33364.169455713076
1984	33783.0103167412
1985	34352.53941823111
1986	35131.63042889904
1987	35956.736814497395
1988	36455.3050017585
1989	37075.81841441625
1990	37275.798368262615
1991	37482.983381407095
1992	37245.86137254929
1993	36771.07359986642
1994	36923.95622902134
1995	37001.76316672967
1996	37388.04417462594
1997	38059.37628603733
1998	38834.1853656963
1999	39477.39133758762
2000	40139.76459947597
2001	40833.081221442124
2002	40682.00598304843
2003	40571.1731503943
2004	41043.81874884484
2005	41319.65936868611
2006	41686.25737695533
2007	42194.85787926645
2008	42292.39807162768
2009	42415.68053396006
2010	42762.567353369435
2011	42886.86670600665
2012	43367.65054423924
2013	43840.48627344461
2014	43738.0429403185
2015	44306.91039207137
2016	44541.97705806046
2017	44637.07757817519
2018	44603.00294756197
2019	44823.39006282427
2020	42999.277289298465
2021	43441.72877392002
2022	44884.6495029689
2023	45439.551993731686