Year	Percent
1995	89.72272
1996	88.76871
1997	89.54675
1998	90.07576
1999	90.16769
2000	90.20541
2001	90.6515
2002	90.66011
2003	90.54499
2004	90.46044
2005	90.21025
2006	89.93519
2007	90.18926
2008	89.84731
2009	89.10545
2010	89.20834
2011	89.06312
2012	88.84919
2013	88.8692
2014	88.44594
2015	88.19289
2016	88.14513
2017	88.94146