Year	Percent
1995	92.44
1996	92.81
1997	92.48
1998	92.42
1999	89.79
2000	85.07
2001	84.25
2002	85.53
2003	84.22
2004	84.81
2005	84.92
2006	85.13
2007	84.12
2008	84.05
2009	84.02
2010	84.41