Year	US Dollars adjusted for inflation)
1960	238.85456
1961	245.19858
1962	256.77717
1963	250.11785
1964	252.26183
1965	257.91508
1966	255.28153
1967	273.30022
1968	276.9742
1969	277.77409
1970	273.33152
1971	272.41046
1972	273.83695
1973	270.1829
1974	287.26456
1975	290.37311
1976	309.15385
1977	304.24223
1978	311.83418
1979	316.43775
1980	311.89157
1981	317.60755
1982	339.56329
1983	332.26018
1984	318.10243
1985	336.41159
1986	353.88802
1987	343.97045
1988	354.48898
1989	352.67786
1990	341.35262
1991	362.47892
1992	353.66879
1993	356.12886
1994	351.10446
1995	361.12142
1996	389.96545
1997	403.21694
1998	420.72345
1999	439.29973
2000	434.76333
2001	450.45228
2002	456.73413
2003	478.30435
2004	485.3074
2005	511.96759
2006	527.96235
2007	541.2687
2008	563.44707
2009	562.84194
2010	575.44645
2011	595.39325
2012	615.09708
2013	631.61218
2014	639.70955
2015	645.36986
2016	663.96176
2017	688.53389