Quarter	Percent
2000-04-01	46.9
2001-04-01	47.4
2002-04-01	48.2
2003-04-01	49.7
2004-04-01	50.1
2005-01-01	50.9
2005-04-01	51.4
2005-07-01	51.9
2005-10-01	52.1
2006-01-01	51.6
2006-04-01	52.6
2006-07-01	53.3
2006-10-01	52.9
2007-01-01	52.7
2007-04-01	53.7
2007-07-01	54.3
2007-10-01	54.1
2008-01-01	53.9
2008-04-01	54.9
2008-07-01	55.2
2008-10-01	55.1
2009-01-01	54.2
2009-04-01	54.9
2009-07-01	54.8
2009-10-01	54.6
2010-01-01	54.1
2010-04-01	54.5
2010-07-01	54.7
2010-10-01	54.6
2011-01-01	54.3
2011-04-01	55.0
2011-07-01	55.0
2011-10-01	55.3
2012-01-01	54.9
2012-04-01	56.2
2012-07-01	56.9
2012-10-01	56.9
2013-01-01	56.1
2013-04-01	57.1
2013-07-01	58.1
2013-10-01	58.2
2014-01-01	57.8
2014-04-01	58.6
2014-07-01	59.3
2014-10-01	59.5
2015-01-01	59.0
2015-04-01	59.9
2015-07-01	60.7
2015-10-01	60.8
2016-01-01	61.0
2016-04-01	61.8
2016-07-01	62.4
2016-10-01	62.6
2017-01-01	62.2
2017-04-01	63.7
2017-07-01	64.2
2017-10-01	64.6
2018-01-01	64.2
2018-04-01	65.2