Quarter	Percent
2000-04-01	34.1
2001-04-01	34.6
2002-04-01	36.1
2003-04-01	37.5
2004-04-01	38.3
2005-01-01	39.9
2005-04-01	40.5
2005-07-01	40.7
2005-10-01	41.0
2006-01-01	41.0
2006-04-01	41.7
2006-07-01	42.0
2006-10-01	42.3
2007-01-01	42.4
2007-04-01	43.6
2007-07-01	43.6
2007-10-01	43.6
2008-01-01	43.5
2008-04-01	44.5
2008-07-01	44.7
2008-10-01	44.8
2009-01-01	44.6
2009-04-01	45.6
2009-07-01	45.1
2009-10-01	45.3
2010-01-01	45.3
2010-04-01	45.7
2010-07-01	45.9
2010-10-01	46
2011-01-01	46.1
2011-04-01	47.0
2011-07-01	47.2
2011-10-01	47.6
2012-01-01	47.6
2012-04-01	48.5
2012-07-01	49.0
2012-10-01	49.1
2013-01-01	48.9
2013-04-01	49.8
2013-07-01	50.5
2013-10-01	50.7
2014-01-01	50.7
2014-04-01	51.5
2014-07-01	52.1
2014-10-01	52.3
2015-01-01	52.4
2015-04-01	53.2
2015-07-01	53.7
2015-10-01	53.8
2016-01-01	54.4
2016-04-01	55.3
2016-07-01	55.6
2016-10-01	55.8
2017-01-01	55.9
2017-04-01	57.2
2017-07-01	57.4
2017-10-01	58.0
2018-01-01	57.9
2018-04-01	58.5