Year	Percent
1995	60.02
1996	58.28
1997	61.51
1998	66.06
1999	70.78
2000	67.77
2001	64.87
2002	64.54
2003	67.02
2004	61.71
2005	68.43
2006	66.74
2007	69.19
2008	68
2009	69.32
2010	65.29