Year	Percent
2001	76.4458
2002	79.97782
2003	80.63946
2004	80.7404
2005	82.09046
2006	82.03125
2007	82.29331
2008	82.25571
2009	81.89872
2010	82.33465
2011	81.51011
2012	81.46786
2013	80.8881
2015	82.53882