Quarter	Percent
2005-01-01	49.0
2005-04-01	49.3
2005-07-01	49.3
2005-10-01	49.3
2006-01-01	50.0
2006-04-01	49.4
2006-07-01	49.4
2006-10-01	50.4
2007-01-01	49.8
2007-04-01	49.4
2007-07-01	49.2
2007-10-01	50.9
2008-01-01	50.4
2008-04-01	50.7
2008-07-01	48.5
2008-10-01	48.3
2009-01-01	48.6
2009-04-01	47.9
2009-07-01	47.5
2009-10-01	47.8
2010-01-01	48.3
2010-04-01	48.0
2010-07-01	46.9
2010-10-01	46.7
2011-01-01	47.6
2011-04-01	47.0
2011-07-01	46.9
2011-10-01	47.6
2012-01-01	46.9
2012-04-01	46.5
2012-07-01	46.6
2012-10-01	47.2
2013-01-01	47.2
2013-04-01	46.9
2013-07-01	47.1
2013-10-01	47.0
2014-01-01	46.2
2014-04-01	46.2
2014-07-01	45.9
2014-10-01	46.2
2015-01-01	46.3
2015-04-01	45.5
2015-07-01	45.3
2015-10-01	45.1
2016-01-01	44.5
2016-04-01	44.3
2016-07-01	44.4
2016-10-01	44.3
2017-01-01	44.6
2017-04-01	43.7
2017-07-01	44.2
2017-10-01	44.2
2018-01-01	44.3
2018-04-01	44.1