Year	US Dollars adjusted for inflation)
1989	9867.37091
1990	9534.49562
1991	9033.07192
1992	7717.09454
1993	7056.15512
1994	6176.8661
1995	5919.34063
1996	5714.55124
1997	5804.1424
1998	5505.62779
1999	5876.14516
2000	6491.00136
2001	6850.51713
2002	7208.57072
2003	7769.67023
2004	8360.81192
2005	8927.90566
2006	9687.49351
2007	10532.32627
2008	11089.92995
2009	10219.52131
2010	10674.98771
2011	11230.38915
2012	11621.38568
2013	11803.70896
2014	11680.59354
2015	11325.78769
2016	11279.62534
2017	11441.00346