Year	Percent
1995	79.69
1996	79.56
1997	79.64
1998	79.52
1999	79.45
2000	79.38
2001	79.38
2002	79.66
2003	78.92
2004	78.82
2005	78.84
2006	78.74
2007	78.34
2008	77.7
2009	77.93
2010	77.85