Year	Percent
1995	72.89
1996	73.39
1997	71.96
1998	65.38
1999	71.13
2000	70.03
2001	71.9
2002	71.16
2003	69.91
2004	68.58
2005	69.3
2006	69.9
2007	70.84
2008	72.24
2009	72.32
2010	72.62