Year	Percent
1990	64.1
1991	64.36
1992	64.62
1993	64.87
1994	65.13
1995	65.38
1996	65.64
1997	65.9
1998	66.15
1999	66.41
2000	66.67
2001	66.67
2002	66.67
2003	66.67
2004	66.67
2005	66.67
2006	67.18
2007	67.69
2008	68.21
2009	68.72
2010	69.23
2011	69.23
2012	69.23
2013	69.23
2014	69.23
2015	69.23