Year	Percent
2005	55.09273
2006	58.21697
2007	57.88328
2008	57.78009
2009	54.20031
2010	53.15037
2011	56.28786
2012	53.83736
2013	51.89755
2014	56.54477
2015	54.16877
2016	57.94069
2017	54.15