Year	US Dollars adjusted for inflation)
1986	931.458
1987	944.06439
1988	1049.98483
1989	1056.95211
1990	1095.93263
1991	993.50972
1992	845.70961
1993	714.76283
1994	571.404
1995	535.04396
1996	564.53145
1997	611.52129
1998	614.98985
1999	628.06932
2000	654.31231
2001	682.62414
2002	676.26963
2003	716.26425
2004	757.37443
2005	747.56562
2006	762.52012
2007	819.8063
2008	880.27882
2009	894.81796
2010	880.03778
2011	921.17704
2012	905.16567
2013	984.23903
2014	1003.5104
2015	1021.16079
2016	1043.95111
2017	1070.32341