Year	Percent
2001	63.0089
2002	59.71881
2003	64.44804
2004	61.63125
2005	62.87864
2006	64.28013
2007	63.19076
2008	64.22264
2009	64.92983
2010	64.12273
2011	63.04675
2012	62.85126
2013	64.26111
2014	65.6318
2015	64.56559
2016	61.53015
2017	61.37846