Year	US Dollars adjusted for inflation)
1960	214.13695
1961	181.21768
1962	193.95324
1963	198.12222
1964	206.28944
1965	209.80351
1966	214.27114
1967	237.7556
1968	231.17092
1969	222.72481
1970	265.22918
1971	268.64421
1972	248.69779
1973	263.27208
1974	258.46259
1975	256.51582
1976	271.84296
1977	296.55611
1978	286.81818
1979	284.36119
1980	279.95897
1981	306.10152
1982	295.17478
1983	298.20417
1984	290.66022
1985	315.87285
1986	316.74231
1987	324.37964
1988	330.86692
1989	326.18228
1990	329.15778
1991	337.70835
1992	333.94322
1993	307.12348
1994	290.31982
1995	263.27085
1996	239.03963
1997	232.50687
1998	240.6276
1999	234.68485
2000	228.24757
2001	227.42811
2002	230.99615
2003	221.22748
2004	224.51555
2005	219.18655
2006	223.40359
2007	226.30444
2008	229.8347
2009	230.05317
2010	231.19433
2011	233.51813
2012	235.70529
2013	239.33107
2014	243.10191
2015	226.52806
2016	218.28353
2017	212.54742