Year	Percent
1995	82.27
1996	82.31
1997	81.23
1998	80.39
1999	80.73
2000	80.81
2001	81.4
2002	81.26
2003	80.42
2004	80.75
2005	81.58
2006	79.45
2007	80.38
2008	80.78
2009	82.32
2010	82.53