Year	Percent
1995	76.8
1996	78.18
1997	75.38
1998	74.8
1999	74.58
2000	74.61
2001	75.41
2002	73.8
2003	74.78
2004	76.02
2005	75.93
2006	73.87
2007	73.51
2008	74.96
2009	75.1
2010	74.74