Year	Percent
1995	77.01
1996	79.03
1997	78.37
1998	71.58
1999	70.1
2000	66.29
2001	80.37
2002	80.84
2003	83.78
2004	81.64
2005	79.43
2006	80.83
2007	78.44
2008	77.27
2009	77.95
2010	77.31