Year	Percent
1995	86.66
1996	86.42
1997	85.2
1998	85.37
1999	86.01
2000	85.97
2001	86.02
2002	89.19
2003	85.75
2004	86.56
2005	85.72
2006	85.37
2007	85.57
2008	85.17
2009	85.36
2010	85.36