Year	Percent
1995	59.35
1996	58.5
1997	58.2
1998	59.8
1999	56.82
2000	60.41
2001	59.66
2002	57.32
2003	56.48
2004	53.39
2005	54.64
2006	57.72
2007	52.97
2008	48.87
2009	49.1
2010	60.57