Year	Percent
1995	86.65
1996	86.93
1997	85.82
1998	85.79
1999	85.73
2000	84.89
2001	81.14
2002	81.42
2003	82.01
2004	81.37
2005	81.16
2006	81.13
2007	81.36
2008	81.5
2009	81.49
2010	81.1