Year	Percent
1995	78.35
1996	81.91
1997	83.31
1998	85.97
1999	83.02
2000	81.48
2001	80.66
2002	79.91
2003	74.92
2004	81.2
2005	75.73
2006	77.29
2007	83.37
2008	74.58
2009	68.49
2010	68.51