Year	Percent
1995	85.15
1996	87.61
1997	86.25
1998	84.24
1999	84
2000	82.7
2001	85.14
2002	87.14
2003	89.9
2004	91.97
2005	93.2
2006	93.42
2007	92.06
2008	92.49
2009	92.72
2010	91.87