Quarter	Percent
2005-01-01	52.2
2005-04-01	53.3
2005-07-01	55.3
2005-10-01	53.1
2006-01-01	52.2
2006-04-01	53.5
2006-07-01	55.5
2006-10-01	53.1
2007-01-01	52.0
2007-04-01	53.2
2007-07-01	54.9
2007-10-01	52.8
2008-01-01	51.7
2008-04-01	53.4
2008-07-01	55.0
2008-10-01	52.1
2009-01-01	50.6
2009-04-01	52.1
2009-07-01	53.3
2009-10-01	50.6
2010-01-01	49.7
2010-04-01	51.3
2010-07-01	52.6
2010-10-01	50.2
2011-01-01	49.5
2011-04-01	50.9
2011-07-01	52.5
2011-10-01	50.6
2012-01-01	49.2
2012-04-01	51.1
2012-07-01	52.6
2012-10-01	50.3
2013-01-01	49.3
2013-04-01	50.9
2013-07-01	52.5
2013-10-01	49.7
2014-01-01	49.3
2014-04-01	50.6
2014-07-01	52.5
2014-10-01	50.0
2015-01-01	49.2
2015-04-01	50.3
2015-07-01	52.0
2015-10-01	50.1
2016-01-01	49.1
2016-04-01	50.7
2016-07-01	52.2
2016-10-01	50.2
2017-01-01	49.3
2017-04-01	50.8