Year	US Dollars adjusted for inflation)
1960	331.57801
1961	310.69094
1962	339.72343
1963	301.19071
1964	258.74815
1965	270.78638
1966	282.24458
1967	293.00433
1968	303.87029
1969	326.81803
1970	335.91759
1971	329.96989
1972	321.25728
1973	322.69367
1974	317.60587
1975	301.45704
1976	349.01242
1977	344.62831
1978	363.94022
1979	393.67099
1980	414.50666
1981	422.70656
1982	416.69685
1983	427.27205
1984	394.66337
1985	396.0024
1986	398.9278
1987	379.60998
1988	379.87018
1989	369.9514
1990	360.08865
1991	360.19606
1992	401.25989
1993	392.24794
1994	204.73167
1995	280.44327
1996	306.51414
1997	327.17851
1998	329.04919
1999	319.15704
2000	327.23604
2001	342.05678
2002	377.80125
2003	379.71011
2004	401.60079
2005	430.79671
2006	459.56595
2007	482.03701
2008	521.44542
2009	539.07431
2010	563.40135
2011	592.98943
2012	627.96848
2013	640.81376
2014	672.63964
2015	714.39393
2016	738.83019
2017	765.22456