Year	Percent
2006	60.9247
2007	58.2344
2008	57.3879
2009	59.3702
2010	53.307
2011	54.7662
2012	51.7912
2013	50.9779
2014	54.9827
2015	43.3417
2016	48.7667
2017	48.5865