Year	Percent
1995	77.7
1996	76.18
1997	75.03
1998	75.52
1999	75.66
2000	74.01
2001	73.29
2002	73.37
2003	71.88
2004	73.11
2005	72.15
2006	72.27
2007	72.26
2008	73.44
2009	73.41
2010	73.66