Year	Percent
2004	7.23
2005	8.04
2006	6.87
2007	6.78
2008	9.01
2009	8.85
2010	8.09
2011	7.95
2012	7.55
2013	7.69
2014	8.28
2015	8.11
2016	8.01
2017	5.78