Year	Percent
1995	77.44
1996	76.34
1997	76.48
1998	79.56
1999	76.94
2000	73.73
2001	75.79
2002	70.04
2003	74.16
2004	74.63
2005	80.16
2006	80.78
2007	77.73
2008	76.26
2009	79.15
2010	78.41