Quarter	Percent
2005-01-01	47.8
2005-04-01	48.9
2005-07-01	50.6
2005-10-01	48.7
2006-01-01	47.7
2006-04-01	48.9
2006-07-01	50.6
2006-10-01	48.7
2007-01-01	47.6
2007-04-01	48.6
2007-07-01	50.1
2007-10-01	48.4
2008-01-01	47.4
2008-04-01	48.9
2008-07-01	50.1
2008-10-01	47.7
2009-01-01	46.5
2009-04-01	47.9
2009-07-01	49.0
2009-10-01	46.6
2010-01-01	45.7
2010-04-01	47.1
2010-07-01	48.4
2010-10-01	46.1
2011-01-01	45.5
2011-04-01	46.9
2011-07-01	48.2
2011-10-01	46.5
2012-01-01	45.3
2012-04-01	47.0
2012-07-01	48.3
2012-10-01	46.4
2013-01-01	45.5
2013-04-01	47.0
2013-07-01	48.2
2013-10-01	46.1
2014-01-01	45.5
2014-04-01	46.7
2014-07-01	48.2
2014-10-01	46.3
2015-01-01	45.4
2015-04-01	46.7
2015-07-01	48.0
2015-10-01	46.4
2016-01-01	45.5
2016-04-01	47.0
2016-07-01	48.3
2016-10-01	46.4
2017-01-01	45.7
2017-04-01	47.1