Year	US Dollars adjusted for inflation)
1960	349.04955
1961	387.35691
1962	398.17863
1963	413.2159
1964	463.63622
1965	520.72676
1966	548.71792
1967	553.49852
1968	554.31597
1969	587.44512
1970	579.32349
1971	560.73244
1972	586.86329
1973	594.63114
1974	609.27605
1975	610.20883
1976	584.59177
1977	611.84009
1978	664.15134
1979	614.01108
1980	683.3489
1981	639.26698
1982	594.58168
1983	541.73096
1984	551.06827
1985	561.52055
1986	551.60267
1987	536.85264
1988	555.27464
1989	561.44773
1990	545.2061
1991	528.09575
1992	495.45339
1993	411.18144
1994	461.57703
1995	484.9355
1996	512.87984
1997	568.98419
1998	538.73404
1999	535.32245
2000	515.66977
2001	493.2483
2002	475.6992
2003	486.30919
2004	483.76547
2005	476.67155
2006	482.85964
2007	480.77591
2008	478.36178
2009	481.96028
2010	487.92389
2011	498.2429
2012	508.54004
2013	514.94497
2014	531.1561
2015	545.57788
2016	560.69765
2017	577.38226