Year	Percent
2000	88.81363
2001	88.74632
2002	86.46517
2003	86.98797
2004	86.90858
2005	86.89014
2006	87.0771
2007	86.45286
2008	87.20256
2009	86.81389
2010	86.16175
2011	87.03337
2012	87.107
2013	86.81668
2014	86.76388
2015	86.89012
2016	87.08266
2017	85.96148