Year	constant 2015 US$
1970	7823.156883647471
1971	8072.781943581429
1972	8674.247006215333
1973	9305.21589111826
1974	9174.362638960287
1975	9456.634807052107
1976	9627.71231827424
1977	9920.345697738203
1978	10346.65830848554
1979	10925.208306801964
1980	10955.1528376292
1981	11149.901957858696
1982	11588.994335694033
1983	11897.427194644573
1984	12192.809053272498
1985	12613.528687707212
1986	13007.846876641212
1987	13511.650000918022
1988	14147.911733337116
1989	14785.369005817083
1990	15438.911186799216
1991	15719.740278312149
1992	16017.824540144065
1993	16137.978294896026
1994	16460.631774959715
1995	16826.417235556648
1996	17117.04205921647
1997	17170.987608860287
1998	17013.6273260945
1999	17163.920266750312
2000	17399.11291824812
2001	17713.177192737163
2002	17899.76924226264
2003	17974.771779191924
2004	18206.19184554176
2005	18483.12907259045
2006	18642.9046524387
2007	18762.11899676706
2008	18540.530274656234
2009	18373.162174374862
2010	18797.965609383395
2011	18734.040857077664
2012	19144.624779475762
2013	19671.919648031577
2014	19519.46069445279
2015	19497.82710219738
2016	19424.56555403069
2017	19645.066765817868
2018	19715.403242230488
2019	19619.976630659556
2020	18803.014638046352
2021	19037.611669264974
2022	19534.311445930227