Year	Percent
1998-01-01	5.1
1999-01-01	5.4
2000-01-01	5.6
2001-01-01	5.6
2002-01-01	5.6
2003-01-01	5.3
2004-01-01	5.1
2005-01-01	5.0
2006-01-01	4.9
2007-01-01	4.8
2008-01-01	5.6
2009-01-01	5.5
2010-01-01	6.2
2011-01-01	6.2
2012-01-01	7.2
2013-01-01	7.1
2014-01-01	6.5