Quarter	Percent
2000-04-01	61.2
2001-04-01	61.1
2002-04-01	61.1
2003-04-01	61.4
2004-04-01	61.6
2005-01-01	61.7
2005-04-01	62.1
2005-07-01	62.3
2005-10-01	62.2
2006-01-01	62.1
2006-04-01	62.5
2006-07-01	62.9
2006-10-01	62.7
2007-01-01	62.2
2007-04-01	62.6
2007-07-01	63.2
2007-10-01	62.9
2008-01-01	62.7
2008-04-01	63.1
2008-07-01	63.4
2008-10-01	63.2
2009-01-01	63.0
2009-04-01	63.2
2009-07-01	63.3
2009-10-01	63.2
2010-01-01	63
2010-04-01	63.3
2010-07-01	63.5
2010-10-01	63.3
2011-01-01	63.0
2011-04-01	63.4
2011-07-01	63.5
2011-10-01	63.5
2012-01-01	63.3
2012-04-01	63.8
2012-07-01	64.0
2012-10-01	63.9
2013-01-01	63.6
2013-04-01	63.9
2013-07-01	64.1
2013-10-01	63.9
2014-01-01	63.8
2014-04-01	64.0
2014-07-01	64.3
2014-10-01	64.2
2015-01-01	63.8
2015-04-01	64.1
2015-07-01	64.3
2015-10-01	64.3
2016-01-01	64.1
2016-04-01	64.4
2016-07-01	64.6
2016-10-01	64.5
2017-01-01	64.2
2017-04-01	64.7
2017-07-01	64.9
2017-10-01	64.7
2018-01-01	64.5
2018-04-01	64.9