Year	Percent
2005	28.34389
2006	25.00077
2007	25.732
2008	31.12929
2009	31.14358
2010	32.95581
2011	33.93481
2012	28.9597
2013	27.60854
2014	25.77099
2015	27.57581
2016	27.17928
2017	28.87765