Year	Percent
1995	67.51
1996	68.42
1997	69.53
1998	70.3
1999	69.83
2000	72.47
2001	69.39
2002	69.6
2003	69.96
2004	68.41
2005	68.63
2006	69.29
2007	66.87
2008	64.89
2009	64.79
2010	65.48