Year	Percent
1995	88.52
1996	88.68
1997	91.68
1998	91.59
1999	89.64
2000	89.39
2001	89.29
2002	89.06
2003	88.32
2004	73.77
2005	74.4
2006	68.32
2007	66.85
2008	67.76
2009	65.69
2010	65.85