Year	Percent
1996-01-01	6.9
1997-01-01	6.9
1998-01-01	7.4
1999-01-01	7.4
2000-01-01	6.7
2001-01-01	6.2
2002-01-01	6.3
2003-01-01	6.7
2004-01-01	6.3
2005-01-01	6.5
2006-01-01	6.0
2007-01-01	4.9
2008-01-01	4.4
2009-01-01	5.9
2010-01-01	7.3
2011-01-01	8.2