Year	Percent
1995	81.87
1996	79.45
1997	79.88
1998	79
1999	79.38
2000	75.97
2001	81.38
2002	79.8
2003	80.23
2004	79.72
2005	79.8
2006	81.05
2007	78.68
2008	78.25
2009	85.44
2010	80.37