Year	Percent
2006	50.24731
2007	56.97004
2008	46.53705
2009	47.0487
2010	46.37405
2011	45.58665
2012	47.04394
2013	47.76358
2014	48.93579
2015	47.51933
2016	46.13502
2017	45.55829