Year	Percent
2003-01-01	4.7
2004-01-01	4.8
2005-01-01	6.6
2006-01-01	6.8
2007-01-01	7.6
2008-01-01	8.6
2009-01-01	9.6
2010-01-01	9.4
2011-01-01	8.7
2012-01-01	8.6
2013-01-01	9.3
2014-01-01	9.0
2015-01-01	9.7