Quarter	Percent, Seasonally Adjusted
2004-01-01	13.7
2004-04-01	13.9
2004-07-01	13.8
2004-10-01	13.8
2005-01-01	14.1
2005-04-01	13.9
2005-07-01	13.5
2005-10-01	13.2
2006-01-01	13.0
2006-04-01	12.8
2006-07-01	13.0
2006-10-01	12.5
2007-01-01	12.3
2007-04-01	12.4
2007-07-01	12.5
2007-10-01	12.7
2008-01-01	12.8
2008-04-01	13.3
2008-07-01	14.3
2008-10-01	15.3
2009-01-01	17.1
2009-04-01	18.4
2009-07-01	19.1
2009-10-01	19.8
2010-01-01	19.9
2010-04-01	19.1
2010-07-01	18.2
2010-10-01	18.3
2011-01-01	17.6
2011-04-01	17.4
2011-07-01	17.6
2011-10-01	17.8
2012-01-01	17.6
2012-04-01	17.6
2012-07-01	17.5
2012-10-01	17.2
2013-01-01	17.3
2013-04-01	17.5
2013-07-01	17.2
2013-10-01	16.0
2014-01-01	16.2
2014-04-01	15.4
2014-07-01	15.4
2014-10-01	14.4
2015-01-01	14.4
2015-04-01	14.3
2015-07-01	13.5
2015-10-01	13.6
2016-01-01	12.9
2016-04-01	12.8
2016-07-01	12.9
2016-10-01	12.8
2017-01-01	12.1
2017-04-01	11.7
2017-07-01	11.5