Year	Percent
1995	79.11
1996	80.74
1997	79.34
1998	82.78
1999	81.2
2000	80.94
2001	78.12
2002	78.28
2003	75.34
2004	82.59
2005	88.14
2006	86.66
2007	91.41
2008	85.59
2009	91.29
2010	88.15