Year	Percent
2000	87.37458
2001	86.7414
2002	86.26526
2003	83.78158
2004	83.80263
2005	84.59671
2006	84.61916
2007	83.96509
2008	84.38474
2009	84.32368
2010	82.49413
2011	82.41042
2012	82.82304
2013	83.12359
2014	82.52338
2015	81.24062
2016	82.72501
2017	84.14416