Year	Percent
1995	80.29
1996	80.9
1997	81.31
1998	82.19
1999	82.56
2000	82.5
2001	83.56
2002	83.48
2003	83.71
2004	83.56
2005	83.5
2006	83.78
2007	84.1
2008	84.29
2009	84.1
2010	83.9