Year	Percent
1995	73.95
1996	73.54
1997	75.68
1998	76.01
1999	76.75
2000	76.83
2001	76.09
2002	75.8
2003	75.52
2004	75.7
2005	76.14
2006	75.99
2007	76.39
2008	77.16
2009	77.66
2010	77.51