Year	Percent
1995	79.54
1996	81.14
1997	79.74
1998	83.2
1999	81.61
2000	81.34
2001	78.52
2002	78.71
2003	75.83
2004	83.11
2005	88.7
2006	87.21
2007	91.98
2008	86.13
2009	91.81
2010	88.71