Year	Percent
1995	70.87
1996	74.44
1997	72.73
1998	75.06
1999	76.29
2000	76.75
2001	75.02
2002	80
2003	79.6
2004	81.94
2005	81.34
2006	84.96
2007	85.89
2008	85.76
2009	85.34
2010	87.66