Year	US Dollars adjusted for inflation)
1986	2320.58279
1987	2294.37029
1988	2301.68873
1989	2330.42396
1990	2361.3865
1991	2473.40608
1992	2506.23133
1993	2644.51564
1994	2577.72641
1995	2721.86231
1996	2617.98967
1997	2455.6082
1998	2534.35559
1999	2579.48168
2000	2706.82954
2001	2760.98494
2002	2782.27326
2003	2840.87394
2004	2758.10425
2005	2824.93041
2006	2834.90563
2007	2795.30174
2008	2749.0066
2009	2795.22639
2010	2861.77135
2011	2961.78723
2012	2901.88147
2013	2784.55791
2014	2716.32263
2015	2838.86966
2016	2823.43353
2017	2863.33943