Year	US Dollars adjusted for inflation)
1960	4377.43888
1961	4974.19455
1962	5285.61437
1963	5537.47976
1964	5706.51546
1965	6080.80259
1966	6237.25747
1967	6361.82907
1968	6382.5638
1969	6752.46262
1970	7189.17917
1971	7773.71783
1972	8494.20917
1973	9186.84393
1974	12571.43426
1975	14683.63656
1976	19493.07716
1977	16663.769
1978	12365.55034
1979	12130.8477
1980	12139.81476
1981	12443.88461
1982	11755.45254
1983	12096.7445
1984	12665.98213
1985	12042.60242
1986	11624.54754
1987	9369.58487
1988	10284.66802
1989	10860.36024
1990	11117.2374
1991	11483.10197
1992	10835.25169
1993	10969.93908
1994	11085.35403
1995	11342.37
1996	11459.62263
1997	11816.707
1998	11925.95409
1999	10593.39121
2000	10137.6955
2001	10098.74589
2002	9823.3928
2003	9789.01945
2004	9595.98904
2005	9579.49344
2006	9041.80329
2007	9299.59729
2008	8715.58165
2009	8450.06088
2010	8754.14223
2011	9060.71428
2012	9212.45685
2013	9408.19444
2014	9508.28459
2015	9598.44125
2016	9552.78353
2017	9442.02628