Year	Percent
1995	84.51978
1996	84.59124
1997	85.45862
1998	84.44109
1999	84.82258
2000	85.16615
2001	85.66511
2002	85.49405
2003	88.64757
2004	88.22497
2005	86.99213
2006	87.10766
2007	87.90248
2008	88.53515
2009	89.21133
2010	88.5668
2011	88.7245
2012	87.67786
2013	88.30897
2014	88.60974
2015	88.66904
2016	89.10478
2017	89.20186