Year	Percent
1995	86.4286
1996	84.70177
1997	85.47151
1998	86.01597
1999	87.26406
2000	87.05574
2001	87.98766
2002	88.00429
2003	87.70842
2004	87.59719
2005	87.22958
2006	86.66471
2007	87.06979
2008	86.77059
2009	85.54205
2010	85.82959
2011	85.58472
2012	85.23583
2013	85.35333
2014	84.96646
2015	84.63354
2016	84.59994
2017	85.89779