Year	Percent
1995	79.24
1996	79.6
1997	80.14
1998	79.76
1999	79.22
2000	82.44
2001	81.27
2002	81.86
2003	79.39
2004	73.33
2005	65.44
2006	65.74
2007	56.98
2008	90.81
2009	86.63
2010	85.4