Year	US Dollars adjusted for inflation)
1960	1273.4841
1961	1276.44537
1962	1265.43269
1963	1265.65695
1964	1301.02058
1965	1332.23792
1966	1401.47669
1967	1460.57702
1968	1493.23837
1969	1562.45008
1970	1624.33188
1971	1659.86276
1972	1682.86309
1973	1600.41427
1974	1630.06137
1975	1528.91976
1976	1564.58796
1977	1544.9151
1978	1572.9093
1979	1574.80631
1980	1461.13118
1981	1379.40262
1982	1296.56604
1983	1228.98995
1984	1171.78766
1985	1144.17104
1986	1120.22467
1987	1114.47607
1988	1104.79599
1989	822.92164
1990	409.56692
1991	357.60822
1992	236.447
1993	160.25882
1994	124.59558
1995	115.79414
1996	122.85611
1997	235.45134
1998	283.43171
1999	321.90455
2000	392.49021
2001	389.54844
2002	394.73989
2003	271.02214
2004	272.85516
2005	279.79623
2006	292.03774
2007	307.39962
2008	315.87609
2009	319.65574
2010	327.42051
2011	343.6464
2012	361.23251
2013	383.07944
2014	376.58886
2015	367.47598
2016	352.64608
2017	352.28595