Year	Percent
2000	78.70097
2001	78.94428
2002	79.95475
2003	79.37191
2004	79.39926
2005	79.43028
2006	80.60998
2007	81.94982
2008	82.66642
2009	82.69878
2010	83.4752
2011	84.11105
2012	84.8963
2013	83.98568
2014	84.0185
2015	86.71796
2016	87.22494
2017	87.88706