Year	Percent
1995	61.27
1996	61.24
1997	55.4
1998	56.75
1999	57.85
2000	58.01
2001	57.48
2002	57.91
2003	59.69
2004	58.72
2005	62.64
2006	61.17
2007	63.33
2008	65.96
2009	64.71
2010	63.42