Quarter	Percent
2000-04-01	48.5
2001-04-01	48.5
2002-04-01	50.0
2003-04-01	51.5
2004-04-01	52.4
2005-01-01	53.3
2005-04-01	53.7
2005-07-01	53.8
2005-10-01	54.3
2006-01-01	53.9
2006-04-01	54.5
2006-07-01	54.7
2006-10-01	55
2007-01-01	55
2007-04-01	55.6
2007-07-01	55.9
2007-10-01	55.7
2008-01-01	55.6
2008-04-01	56.5
2008-07-01	56.5
2008-10-01	56.9
2009-01-01	56.8
2009-04-01	57.7
2009-07-01	57.2
2009-10-01	57.7
2010-01-01	57.8
2010-04-01	58.2
2010-07-01	58.0
2010-10-01	58.4
2011-01-01	58.2
2011-04-01	58.7
2011-07-01	58.6
2011-10-01	59.6
2012-01-01	59.6
2012-04-01	60.5
2012-07-01	61.0
2012-10-01	61.6
2013-01-01	61.4
2013-04-01	62.2
2013-07-01	62.7
2013-10-01	63.2
2014-01-01	63.2
2014-04-01	63.5
2014-07-01	63.8
2014-10-01	64.6
2015-01-01	64.4
2015-04-01	65.1
2015-07-01	65.5
2015-10-01	65.8
2016-01-01	66.3
2016-04-01	66.9
2016-07-01	67.1
2016-10-01	67.3
2017-01-01	67.0
2017-04-01	68.0
2017-07-01	68.3
2017-10-01	69.0
2018-01-01	68.6
2018-04-01	69.1