Year	Percent
1995	49.59
1996	48.77
1997	45.09
1998	52.02
1999	50.2
2000	57.21
2001	64.59
2002	64.76
2003	63.54
2004	63.05
2005	61.78
2006	61.05
2007	65.88
2008	70.32
2009	66.12
2010	68.78