Year	Percent
2005	26.29
2006	23.42
2007	20.56
2008	15.6386
2009	18.0445
2010	20.4936
2011	23.4639
2012	24.8489
2013	24.2507
2014	20.508
2015	18.7211
2016	16.4842
2017	14.6476