Year	Percent
1995	86.22
1996	86.02
1997	80.54
1998	83.14
1999	82.41
2000	81.74
2001	82.79
2002	79.73
2003	79.04
2004	80.54
2005	79.68
2006	77.64
2007	71.99
2008	75.48
2009	70.65
2010	71.55