Year	Percent
1995	91.62708
1996	92.81401
1997	92.80035
1998	92.66558
1999	93.35834
2000	93.41699
2001	93.19485
2002	92.66229
2003	92.39852
2004	92.12748
2005	92.22879
2006	90.72443
2007	91.30472
2008	91.2929
2009	91.28113
2010	91.53758
2011	92.135
2012	92.22108
2013	92.32425
2014	91.87053
2015	92.25911
2016	92.26442
2017	92.85212