Year	Percent
1998-01-01	5.0
1999-01-01	5.5
2000-01-01	5.5
2001-01-01	6.5
2002-01-01	5.2
2003-01-01	5.0
2004-01-01	4.8
2005-01-01	4.8
2006-01-01	4.9
2007-01-01	4.8
2008-01-01	4.7
2009-01-01	5.0
2010-01-01	4.7
2011-01-01	4.0
2012-01-01	4.2
2013-01-01	4.4
2014-01-01	5.1
2015-01-01	5.6