Year	Percent
1995	64.16
1996	65.9
1997	64.77
1998	58.12
1999	57.34
2000	58.35
2001	57.64
2002	55.02
2003	54.87
2004	56.16
2005	58.19
2006	57.57
2007	57.41
2008	58.49
2009	58.48
2010	58.49