Year	Percent
1995	81.12
1996	84.25
1997	86.08
1998	89.91
1999	89.48
2000	86.56
2001	88.2
2002	84.76
2003	87.67
2004	86.49
2005	91.02
2006	85.62
2007	88.28
2008	88.97
2009	88.67
2010	87.82