Year	Percent
1995	72.18
1996	72.36
1997	72.47
1998	72.2
1999	72.03
2000	71.62
2001	71.2
2002	71.29
2003	70.25
2004	70.4
2005	70.57
2006	71.3
2007	71.48
2008	72.61
2009	73.63
2010	72.81