Year	Percent
1996	94.51042
1997	94.24462
1998	94.35396
1999	94.23811
2000	95.27767
2001	94.66861
2002	95.43138
2003	95.96965
2004	94.91036
2005	95.16224
2006	94.67161
2007	95.18558
2008	95.78598
2009	94.91281
2010	93.23562
2011	93.18807
2012	93.7551
2013	93.3722
2014	92.06744
2015	92.4056
2016	92.59504
2017	92.01161