Year	US Dollars adjusted for inflation)
1997	5014.10719
1998	5275.88107
1999	4793.04983
2000	4950.21952
2001	4984.56762
2002	5059.15491
2003	5164.10298
2004	5383.12039
2005	5599.87737
2006	6072.03417
2007	6476.59479
2008	6932.07236
2009	6516.35737
2010	6682.28116
2011	6890.77306
2012	6697.44638
2013	6928.37453
2014	7045.11612
2015	7279.88886
2016	7492.86341
2017	7812.94761