Year	Percent
1995	92.80836
1996	92.82955
1997	93.10977
1998	92.88788
1999	92.62011
2000	92.68716
2001	92.82368
2002	92.66917
2003	92.99505
2004	93.97946
2005	93.89411
2006	93.66725
2007	92.88573
2008	93.20773
2009	92.99488
2010	92.72408
2011	93.10013
2012	92.97005
2013	92.84122
2014	93.11407
2015	92.93687
2016	92.99329
2017	92.91498