Year	Percent
1995	90.59
1996	90.94
1997	88.77
1998	90.65
1999	88.52
2000	86.75
2001	85.74
2002	85.49
2003	70.94
2004	89.31
2005	87.42
2006	88.49
2007	92.76
2008	90.45
2009	89.49
2010	88.67