Year	US Dollars adjusted for inflation)
1960	6779.88678
1961	7476.29746
1962	7545.85722
1963	8279.94281
1964	8931.28391
1965	9724.5722
1966	10241.81496
1967	10715.5883
1968	11355.57426
1969	12434.22511
1970	13392.30814
1971	14379.90075
1972	15738.28247
1973	16934.80245
1974	15786.26958
1975	16634.47483
1976	17500.31292
1977	17782.12085
1978	18825.09062
1979	19202.05508
1980	19143.12411
1981	18677.47507
1982	18352.43986
1983	18049.18374
1984	18320.5842
1985	18707.56898
1986	18742.31606
1987	18257.80403
1988	18971.64351
1989	19590.06779
1990	19383.93465
1991	19746.38214
1992	19733.29041
1993	19303.66698
1994	19591.39952
1995	19909.5296
1996	20389.31802
1997	21198.79065
1998	21902.73878
1999	22489.31596
2000	23275.44431
2001	24111.41745
2002	24965.59403
2003	26349.27734
2004	27614.40593
2005	27698.51061
2006	29176.39287
2007	30054.88939
2008	29874.74345
2009	28514.81009
2010	26917.75898
2011	24495.71113
2012	22830.52678
2013	22251.25729
2014	22565.68048
2015	22648.76988
2016	22687.60033
2017	23027.41345