Year	Percent
1982	69.5
1985	74
1988	71.1
1992	84.6
1994	90.7
1995	90.4
1996	91.1
1997	83.8
1999	83
2000	83.8
2001	86.9
2006	84.6
2008	89.3
2009	89
2010	89.1
2011	88.6
2012	87.9