Year	Percent
2006	16.78068
2007	16.78678
2008	16.5421
2009	15.60729
2010	15.92256
2011	15.68918
2012	15.52896
2013	14.28503
2014	13.88455
2015	13.2841
2016	11.99847
2017	10.69866