Year	Percent
1998-01-01	6.9
1999-01-01	7.1
2000-01-01	7.0
2001-01-01	6.5
2002-01-01	6.2
2003-01-01	5.9
2004-01-01	7.6
2005-01-01	7.4
2006-01-01	7.0
2007-01-01	6.4
2008-01-01	5.9
2009-01-01	6.0
2010-01-01	6.7
2011-01-01	6.8