Year	Percent
1995	63.81
1996	63.4
1997	64.12
1998	63.87
1999	52.34
2000	50.86
2001	56.55
2002	53.42
2003	54.45
2004	58.02
2005	61.93
2006	58.49
2007	52.16
2008	58.48
2009	59.21
2010	59.39