Quarter	Percent
2000-04-01	49.4
2001-04-01	49.2
2002-04-01	48.4
2003-04-01	47.5
2004-04-01	47.0
2005-01-01	46.3
2005-04-01	46.2
2005-07-01	46.2
2005-10-01	45.9
2006-01-01	45.7
2006-04-01	45.5
2006-07-01	45.3
2006-10-01	45.0
2007-01-01	45.3
2007-04-01	44.9
2007-07-01	44.6
2007-10-01	44.4
2008-01-01	44.5
2008-04-01	44.3
2008-07-01	44.0
2008-10-01	43.8
2009-01-01	44.0
2009-04-01	43.7
2009-07-01	43.8
2009-10-01	43.5
2010-01-01	43.7
2010-04-01	43.5
2010-07-01	43.5
2010-10-01	43.3
2011-01-01	43.4
2011-04-01	43.1
2011-07-01	43.0
2011-10-01	42.7
2012-01-01	42.7
2012-04-01	42.4
2012-07-01	42.4
2012-10-01	42.2
2013-01-01	42.2
2013-04-01	42.1
2013-07-01	42.2
2013-10-01	42.0
2014-01-01	42.1
2014-04-01	42.0
2014-07-01	42.0
2014-10-01	41.7
2015-01-01	42.0
2015-04-01	41.8
2015-07-01	41.9
2015-10-01	41.6
2016-01-01	41.6
2016-04-01	41.4
2016-07-01	41.2
2016-10-01	41.2
2017-01-01	41.4
2017-04-01	41.2
2017-07-01	41.1
2017-10-01	40.9
2018-01-01	41.2
2018-04-01	41.0