Year	Percent
1995	65.78
1996	65.25
1997	66.89
1998	66.36
1999	68.39
2000	66.82
2001	66.28
2002	66.91
2003	66.11
2004	66.68
2005	66.89
2006	66.59
2007	67.51
2008	67.99
2009	67.99
2010	67.99