Year	Percent
1995	82.79
1996	85.63
1997	86.4
1998	85.36
1999	85.46
2000	87.96
2001	85.98
2002	85.08
2003	83.17
2004	83.47
2005	82.76
2006	83.57
2007	83.52
2008	82.1
2009	83.97
2010	83.23