Year	Percent
1995	64.01
1996	65.87
1997	65.45
1998	63.51
1999	61.9
2000	66.03
2001	64.53
2002	64.31
2003	62.87
2004	66.54
2005	67.64
2006	62.11
2007	55.66
2008	61.24
2009	57.92
2010	57.64