Year	Percent
2002	91.14354
2003	92.44786
2004	92.40791
2005	91.99612
2006	91.39282
2007	92.55828
2008	92.75439
2009	93.01961
2010	91.97288
2011	91.98326
2012	91.67334
2013	92.54007
2014	93.72808
2015	93.59584
2016	93.75385
2017	93.79053