Quarter	Percent
2000-04-01	36.8
2001-04-01	37.5
2002-04-01	38.2
2003-04-01	39.9
2004-04-01	40.5
2005-01-01	41.6
2005-04-01	42.3
2005-07-01	42.6
2005-10-01	42.8
2006-01-01	42.6
2006-04-01	43.4
2006-07-01	44
2006-10-01	43.8
2007-01-01	43.5
2007-04-01	44.7
2007-07-01	44.9
2007-10-01	44.8
2008-01-01	44.6
2008-04-01	45.6
2008-07-01	45.9
2008-10-01	45.8
2009-01-01	45.4
2009-04-01	46.2
2009-07-01	46.0
2009-10-01	45.9
2010-01-01	45.8
2010-04-01	46.2
2010-07-01	46.5
2010-10-01	46.4
2011-01-01	46.5
2011-04-01	47.3
2011-07-01	47.5
2011-10-01	47.6
2012-01-01	47.6
2012-04-01	48.6
2012-07-01	49.3
2012-10-01	49.3
2013-01-01	48.9
2013-04-01	49.9
2013-07-01	50.7
2013-10-01	50.9
2014-01-01	50.8
2014-04-01	51.6
2014-07-01	52.2
2014-10-01	52.5
2015-01-01	52.2
2015-04-01	53.1
2015-07-01	53.7
2015-10-01	54.0
2016-01-01	54.3
2016-04-01	55.2
2016-07-01	55.6
2016-10-01	55.8
2017-01-01	55.8
2017-04-01	57.1
2017-07-01	57.5
2017-10-01	57.8
2018-01-01	57.8
2018-04-01	58.6