Year	Percent
1995	77.85
1996	81.41
1997	81.17
1998	83.83
1999	77.76
2000	86.49
2001	81.06
2002	82.36
2003	83.66
2004	83.66
2005	84.18
2006	84
2007	84.5
2008	86
2009	85.16
2010	84.89