Year	Percent
1995	54.05267
1996	55.41626
1997	55.67366
1998	58.48845
1999	60.52355
2000	61.15047
2001	62.56151
2002	62.84548
2003	64.18344
2004	63.89368
2005	64.73421
2006	64.30208
2007	63.80431
2008	65.16446
2009	65.57123
2010	64.16737
2011	64.37817
2012	64.20351
2013	64.3966
2014	64.9666
2015	64.63941
2016	65.01367
2017	64.38796