Year	Percent
1998-01-01	12.6
1999-01-01	12.1
2000-01-01	12.8
2001-01-01	12.6
2002-01-01	12.2
2003-01-01	9.6
2004-01-01	10.5
2005-01-01	11.5
2006-01-01	12.3
2007-01-01	10.6
2008-01-01	11.2
2009-01-01	11.7
2010-01-01	12.3
2011-01-01	11.7
2012-01-01	12.3
2013-01-01	13.3
2014-01-01	13.8