Quarter	Percent
2000-04-01	47.1
2001-04-01	47
2002-04-01	46.8
2003-04-01	46.3
2004-04-01	46
2005-01-01	45.7
2005-04-01	45.4
2005-07-01	45.2
2005-10-01	45.1
2006-01-01	45.1
2006-04-01	44.8
2006-07-01	44.4
2006-10-01	44.6
2007-01-01	44.9
2007-04-01	44.5
2007-07-01	44
2007-10-01	44.1
2008-01-01	44.3
2008-04-01	44
2008-07-01	43.6
2008-10-01	43.7
2009-01-01	43.8
2009-04-01	43.5
2009-07-01	43.4
2009-10-01	43.4
2010-01-01	43.6
2010-04-01	43.2
2010-07-01	43.1
2010-10-01	43.2
2011-01-01	43.3
2011-04-01	43.0
2011-07-01	42.8
2011-10-01	42.7
2012-01-01	42.8
2012-04-01	42.4
2012-07-01	42.2
2012-10-01	42.2
2013-01-01	42.3
2013-04-01	42.1
2013-07-01	41.9
2013-10-01	41.9
2014-01-01	42.0
2014-04-01	41.9
2014-07-01	41.6
2014-10-01	41.6
2015-01-01	41.9
2015-04-01	41.6
2015-07-01	41.6
2015-10-01	41.5
2016-01-01	41.6
2016-04-01	41.3
2016-07-01	41.1
2016-10-01	41.2
2017-01-01	41.3
2017-04-01	40.9
2017-07-01	40.8
2017-10-01	40.9
2018-01-01	41.1
2018-04-01	40.7