Year	Percent
2001	0.83605
2002	0.87576
2003	0.87431
2004	0.87585
2005	0.89235
2006	0.88949
2007	0.86047
2008	0.87755
2009	0.8847
2010	0.8891
2011	0.89491
2012	0.89776
2013	0.91293
2015	0.93782