Year	US Dollars adjusted for inflation)
1960	10867.70366
1961	11681.30547
1962	12322.31451
1963	12918.96745
1964	13171.60209
1965	13487.99005
1966	14184.53188
1967	15093.14726
1968	15979.65754
1969	16858.40759
1970	17653.01526
1971	17890.32129
1972	18445.54557
1973	19626.3936
1974	20570.81838
1975	20020.92257
1976	21340.7658
1977	21794.43366
1978	22420.57388
1979	23688.05915
1980	24450.14431
1981	24626.97568
1982	24710.51652
1983	24990.36094
1984	25790.74798
1985	26504.73426
1986	27261.27663
1987	28128.57514
1988	29294.23513
1989	30264.12683
1990	30839.27833
1991	31292.05309
1992	31531.69002
1993	31243.67902
1994	31909.23671
1995	32829.88275
1996	33242.8523
1997	33835.07313
1998	34371.98202
1999	34902.26213
2000	36180.77833
2001	36801.29381
2002	36837.86399
2003	36729.97554
2004	37070.33052
2005	37238.93653
2006	37872.16836
2007	38236.79561
2008	37585.33735
2009	35363.40046
2010	35849.3732
2011	35994.13358
2012	34885.2969
2013	33887.29817
2014	33615.97178
2015	33968.70396
2016	34318.49682
2017	34877.82914