Year	Percent
1995	77.17
1996	76.68
1997	77.29
1998	77.03
1999	77.48
2000	78.02
2001	76.42
2002	77.9
2003	78.34
2004	79.63
2005	79.68
2006	80.07
2007	82.4
2008	82.84
2009	83.03
2010	83.22