Year	Percent
1995	84.79
1996	84.62
1997	82.59
1998	81.07
1999	83.31
2000	82.17
2001	80.88
2002	82.17
2003	82.06
2004	81.18
2005	80.85
2006	81.97
2007	82.13
2008	84.8
2009	84.32
2010	86.45