Year	Percent
2001	71.3
2002	71.3
2003	72.7
2004	71.9
2005	69.5
2006	66.8
2007	65.2
2008	63.1
2009	64.4
2010	65.4
2011	65.2
2012	69.3
2013	68.5
2014	65