Year	Percent
1995	79.88
1996	81.62
1997	82.68
1998	82.28
1999	80.39
2000	84.07
2001	80.7
2002	82.54
2003	81.2
2004	80.73
2005	81.38
2006	78.52
2007	74.55
2008	75.49
2009	69.8
2010	70.13