Year	US Dollars adjusted for inflation)
1960	716.08177
1961	713.37738
1962	712.00406
1963	688.1817
1964	697.79167
1965	677.29122
1966	673.82747
1967	692.94134
1968	721.15143
1969	728.42187
1970	746.52197
1971	755.01272
1972	725.14838
1973	686.78216
1974	681.19041
1975	670.57183
1976	631.81266
1977	628.57778
1978	594.59503
1979	634.72334
1980	621.71548
1981	545.47201
1982	520.35591
1983	510.12593
1984	504.15029
1985	495.65545
1986	491.27588
1987	483.2626
1988	485.8106
1989	491.43553
1990	492.39891
1991	448.03551
1992	440.13721
1993	436.10167
1994	422.74616
1995	416.93832
1996	412.80834
1997	414.77425
1998	417.66668
1999	423.57614
2000	430.109
2001	442.13582
2002	374.48909
2003	398.90198
2004	407.51746
2005	413.86749
2006	422.14117
2007	435.71725
2008	453.63656
2009	423.30574
2010	412.73093
2011	407.32728
2012	408.34213
2013	406.37499
2014	408.66103
2015	410.19416
2016	416.00272
2017	421.89125