Year	Percent
1995	80.67
1996	83.35
1997	85.3
1998	89.2
1999	88.83
2000	85.87
2001	87.5
2002	83.38
2003	86.08
2004	84.95
2005	90.28
2006	81.28
2007	84.01
2008	84.81
2009	81.9
2010	81.12