Year	Percent
1995	53.7
1996	49.59
1997	48.58
1998	51.92
1999	50.97
2000	66.81
2001	66.35
2002	64.33
2003	73.99
2004	65.04
2005	64.82
2006	60.97
2007	61.48
2008	61.21
2009	66.32