Year	US Dollars adjusted for inflation)
1990	5356.37243
1991	4705.12103
1992	4331.5702
1993	4403.78261
1994	4583.59557
1995	4920.72788
1996	5125.89835
1997	4893.09442
1998	4800.89006
1999	4789.12517
2000	4910.18087
2001	5257.61512
2002	5632.35086
2003	5986.52075
2004	6523.97657
2005	6838.24947
2006	7433.01195
2007	8061.40553
2008	8873.91518
2009	8419.28357
2010	8231.31277
2011	8439.80075
2012	8582.42302
2013	8918.57502
2014	9227.43745
2015	9639.38726
2016	10162.10734
2017	10932.32715