Year	Percent
1995	64.04
1996	58.29
1997	60.78
1998	55.12
1999	55.39
2000	60.12
2001	65.14
2002	66.81
2003	66.89
2004	65.2
2005	62.05
2006	58.93
2007	59.55
2008	59.08
2009	60.99
2010	63.59