Year	Percent
1995	67.95
1996	68.34
1997	65.21
1998	65.39
1999	65.41
2000	65.8
2001	67.56
2002	68.4
2003	65.59
2004	64.55
2005	64.39
2006	64.76
2007	64
2008	65.49
2009	58.58
2010	65.01