Year	Percent
1995	76.25
1996	76.05
1997	77.61
1998	83.53
1999	81.74
2000	81.46
2001	81.1
2002	82.27
2003	87.34
2004	86.98
2005	88.7
2006	85.8
2007	80.4
2008	80.74
2009	76.86
2010	79.71