Year	Percent
1995	93.05659
1996	93.01396
1997	93.85057
1998	94.35649
1999	93.24259
2000	93.53795
2001	93.45003
2002	93.40384
2003	93.46637
2004	93.4313
2005	93.28882
2006	93.32153
2007	93.40677
2008	93.05395
2009	92.69176
2010	92.66949
2011	92.64628
2012	92.53598
2013	92.44117
2014	91.96205
2015	91.78359
2016	91.8125
2017	92.11449