Year	Percent
1995	58.51599
1996	57.83171
1997	58.46258
1998	58.56551
1999	58.99877
2000	60.06681
2001	60.62951
2002	61.29016
2003	62.19013
2004	62.65082
2005	63.06722
2006	62.97008
2007	63.582
2008	64.8243
2009	66.83988
2010	66.16055
2011	66.40417
2012	66.5015
2013	66.99729
2014	66.49459
2015	65.64166
2016	65.62152
2017	65.15927