Year	Percent
1995	86.22
1996	86.54
1997	84.49
1998	86.28
1999	84.26
2000	82.29
2001	81.6
2002	81.37
2003	63.17
2004	81.75
2005	73.78
2006	78.35
2007	83.07
2008	81
2009	80.13
2010	79.4