Year	Percent
2005	44.88
2006	43.24
2007	40.74
2008	30.9669
2009	39.3005
2010	45.5029
2011	47.6271
2012	47.8715
2013	44.6027
2014	46.1205
2015	40.0938
2016	32.1766
2017	29.1809