Year	US Dollars adjusted for inflation)
1970	488.41351
1971	459.98769
1972	479.25831
1973	475.10104
1974	488.58007
1975	520.46498
1976	542.23342
1977	501.69274
1978	566.292
1979	574.69334
1980	477.95309
1981	555.31826
1982	566.02155
1983	533.05784
1984	566.51894
1985	575.27256
1986	557.01009
1987	559.8058
1988	572.14185
1989	593.05471
1990	614.46188
1991	630.31066
1992	621.8676
1993	619.8966
1994	625.38679
1995	639.36425
1996	700.02523
1997	732.46638
1998	517.78295
1999	514.14665
2000	532.26764
2001	533.49809
2002	517.61995
2003	509.65695
2004	512.42753
2005	522.48953
2006	522.5108
2007	527.13828
2008	531.21033
2009	535.85999
2010	546.72167
2011	576.0128
2012	551.63734
2013	554.91149
2014	545.89849
2015	564.72995
2016	585.16831
2017	604.62454