Year	Percent
1995	80.73
1996	82.14
1997	82.12
1998	75.26
1999	73.89
2000	73.5
2001	75.77
2002	75.62
2003	73.93
2004	77.91
2005	77.27
2006	78.01
2007	75.07
2008	73.18
2009	74.05
2010	75.04