Year	Percent
2002	5.23
2003	5.77
2004	5.66
2005	5.27
2006	5.13
2007	3.24
2008	2.73
2009	4.07
2010	5.1577
2011	4.9531
2012	3.842
2013	3.8428
2014	2.9749
2015	2.427
2016	2.6809
2017	3.211