Year	Percent
1995	75.37
1996	77.64
1997	74.35
1998	73.76
1999	72.85
2000	73.33
2001	77.43
2002	77.34
2003	78.67
2004	71.06
2005	72.07
2006	74.36
2007	77.32
2008	79.54
2009	79.29
2010	77.89