Year	Percent
1995	83.96
1996	81.6
1997	81.28
1998	74.78
1999	72.37
2000	70.74
2001	68.98
2002	70.21
2003	72.83
2004	72.39
2005	72.3
2006	72.54
2007	70.32
2008	70.98
2009	69.71
2010	69.38