Year	Percent
1995	63.82
1996	64.35
1997	66.02
1998	61.22
1999	58.14
2000	60.1
2001	59.32
2002	62.82
2003	60.09
2004	62.56
2005	66.19
2006	69.89
2007	68.16
2008	65.15
2009	64.56
2010	62.84