Year	US Dollars adjusted for inflation)
1979	2400.02106
1980	2070.29832
1981	2103.61275
1982	2273.95278
1983	2529.88606
1984	2710.38428
1985	2675.27274
1986	2611.26965
1987	2478.19578
1988	2379.1363
1989	2356.71937
1990	2564.65399
1991	2572.46665
1992	2563.24
1993	2508.61908
1994	2662.60252
1995	2625.16277
1996	2630.53037
1997	2709.34143
1998	2777.02282
1999	2736.12334
2000	2839.93247
2001	2679.65554
2002	2481.52293
2003	2522.92281
2004	2556.89943
2005	2625.26907
2006	2777.66596
2007	2850.72305
2008	2962.00822
2009	2987.93517
2010	2965.80243
2011	2932.87208
2012	2916.63935
2013	2907.61023
2014	2909.77542
2015	2823.70783
2016	2873.69294
2017	2939.52071