Year	Percent
1995	62.64
1996	66.94
1997	68.69
1998	66.6
1999	67.19
2000	68.8
2001	72.22
2002	72.27
2003	82.1
2004	81.75
2005	81.34
2006	80.68
2007	80.16
2008	79.47
2009	78.42
2010	77.45