Year	US Dollars adjusted for inflation)
1967	340.69416
1968	348.7667
1969	344.76676
1970	360.53465
1971	363.95512
1972	378.77483
1973	366.77611
1974	354.80775
1975	389.09342
1976	434.42812
1977	454.04986
1978	439.61817
1979	476.57913
1980	447.37473
1981	445.0742
1982	403.67753
1983	402.52344
1984	393.54682
1985	465.02965
1986	470.1509
1987	462.9443
1988	490.28924
1989	502.85326
1990	481.25485
1991	526.13635
1992	496.81383
1993	499.22041
1994	504.35854
1995	495.69819
1996	517.08696
1997	528.26827
1998	553.66507
1999	569.70421
2000	553.57801
2001	620.28478
2002	620.55831
2003	656.49189
2004	645.92298
2005	666.25762
2006	674.74013
2007	675.40921
2008	684.49442
2009	693.54607
2010	708.37076
2011	709.39938
2012	683.0016
2013	678.75628
2014	705.78847
2015	726.24807
2016	745.87072
2017	762.22597