Year	Percent
2000	87.33523
2001	86.41595
2002	87.49833
2003	87.50531
2004	87.36774
2005	87.67011
2006	88.15635
2007	88.67244
2008	88.86572
2009	88.54703
2010	88.49983
2011	88.86729
2012	88.94105
2013	88.04788
2014	87.64701
2015	87.71573
2016	88.3432
2017	88.38978