Year	Percent
1995	73.57
1996	73.11
1997	69.78
1998	71.2
1999	69.43
2000	73.15
2001	72.67
2002	70.5
2003	70.82
2004	74.11
2005	74.71
2006	78.96
2007	80.46
2008	82.82
2009	78.24
2010	78.26