Year	Percent
1995	69.22
1996	70.88
1997	69.58
1998	65.67
1999	66.02
2000	63.99
2001	63.23
2002	64.62
2003	62.92
2004	62.26
2005	60.49
2006	60.26
2007	59.42
2008	60.35
2009	60.32
2010	60.32