Year	US Dollars adjusted for inflation)
1990	5890.27604
1991	5209.6816
1992	4936.99125
1993	4512.6202
1994	4001.66928
1995	3738.46947
1996	3814.49933
1997	3941.12485
1998	3933.55777
1999	4078.42679
2000	4491.59182
2001	5106.63417
2002	5606.853
2003	6107.70926
2004	6647.69213
2005	7227.98295
2006	7917.19534
2007	8523.7662
2008	8698.42365
2009	8573.70829
2010	9070.48825
2011	9603.24466
2012	9923.42221
2013	10368.4993
2014	10646.03446
2015	10617.47465
2016	10582.70087
2017	10857.37728