Year	Percent
2004-01-01	5.3
2005-01-01	5.0
2006-01-01	4.7
2007-01-01	4.4
2008-01-01	4.8
2009-01-01	7.2
2010-01-01	7.3
2011-01-01	6.6
2012-01-01	6.2
2013-01-01	6.1
2014-01-01	5.4
2015-01-01	5.0
2016-01-01	4.7