Year	US Dollars adjusted for inflation)
1975	1663.01128
1976	2011.55419
1977	2087.30572
1978	2459.65061
1979	2608.03845
1980	3006.1359
1981	3036.67769
1982	3135.42177
1983	3068.65329
1984	3198.36515
1985	3176.87928
1986	3269.52178
1987	3238.76826
1988	3056.86181
1989	2534.71898
1990	2440.39463
1991	2357.23074
1992	2645.81498
1993	2622.15154
1994	2623.57206
1995	2678.07426
1996	2650.80923
1997	2672.81685
1998	2699.40995
1999	2743.02603
2000	2810.03515
2001	2906.62275
2002	3020.08985
2003	3082.05495
2004	3262.19058
2005	3417.73014
2006	3557.30269
2007	3687.23364
2008	3773.18767
2009	3786.53348
2010	3679.19027
2011	3578.76581
2012	3481.68874
2013	3401.07604
2014	3348.82685
2015	3297.89441
2016	3258.49324
2017	3238.252