Year	Percent
2006	47.82047
2007	50.65979
2008	54.24649
2009	51.9344
2010	55.41489
2011	56.8934
2012	52.35714
2013	49.59176
2014	51.21688
2015	50.39178
2016	50.90927
2017	53.34651