Year	Percent
2006	11.26637
2007	11.28014
2008	10.52985
2009	9.93559
2010	10.11439
2011	9.60694
2012	9.46241
2013	9.54219
2014	9.36351
2015	8.0335
2016	6.88515
2017	6.70373