Year	Percent
1995	60.2218
1996	59.74319
1997	59.42334
1998	59.2511
1999	59.01372
2000	59.10313
2001	59.48968
2002	59.84321
2003	59.72143
2004	59.92408
2005	59.65283
2006	59.88627
2007	61.10083
2008	62.98228
2009	65.66653
2010	65.41799
2011	66.6681
2012	67.40411
2013	67.46414
2014	67.47105
2015	66.77762
2016	66.92814
2017	66.44386