Quarter	Percent, Seasonally Adjusted
2004-01-01	27.0
2004-04-01	27.6
2004-07-01	26.1
2004-10-01	27.6
2005-01-01	27.6
2005-04-01	27.1
2005-07-01	28.8
2005-10-01	27.1
2006-01-01	27.2
2006-04-01	26.0
2006-07-01	23.9
2006-10-01	24.3
2007-01-01	23.1
2007-04-01	22.5
2007-07-01	23.8
2007-10-01	24.1
2008-01-01	23.8
2008-04-01	25.1
2008-07-01	24.7
2008-10-01	26.0
2009-01-01	27.9
2009-04-01	28.0
2009-07-01	28.8
2009-10-01	28.7
2010-01-01	28.7
2010-04-01	29.1
2010-07-01	29.4
2010-10-01	30.9
2011-01-01	31.0
2011-04-01	32.3
2011-07-01	32.4
2011-10-01	33.3
2012-01-01	35.9
2012-04-01	36.6
2012-07-01	37.6
2012-10-01	38.8
2013-01-01	39.7
2013-04-01	40.2
2013-07-01	41.7
2013-10-01	44.3
2014-01-01	45.0
2014-04-01	44.3
2014-07-01	44.9
2014-10-01	45.2
2015-01-01	45.0
2015-04-01	44.1
2015-07-01	41.1
2015-10-01	39.5
2016-01-01	39.1
2016-04-01	38.3
2016-07-01	39.3
2016-10-01	40.1
2017-01-01	38.9
2017-04-01	37.9
2017-07-01	37.3
2017-10-01	36.8
2018-01-01	35.8
2018-04-01	34.6