Year	Percent
1995	49.96
1996	60.27
1997	60.7
1998	60.37
1999	56.64
2000	63.82
2001	61.69
2002	63.83
2003	60.44
2004	56.15
2005	56.5
2006	56.86
2007	57.81
2008	58.26
2009	58.69
2010	60.83