Year	Percent
1995	95.17
1996	94.54
1997	93.83
1998	93.06
1999	93.61
2000	93.85
2001	94.41
2002	93.94
2003	94.9
2004	95.33
2005	93.39
2006	92.54
2007	92.87
2008	90.37
2009	90.7
2010	91.16