Quarter	Percent
2005-01-01	56.7
2005-04-01	56.4
2005-07-01	56.3
2005-10-01	56.3
2006-01-01	55.9
2006-04-01	56.5
2006-07-01	56.5
2006-10-01	55.3
2007-01-01	56.3
2007-04-01	56.7
2007-07-01	56.9
2007-10-01	55.0
2008-01-01	55.8
2008-04-01	55.4
2008-07-01	58.0
2008-10-01	58.1
2009-01-01	58.0
2009-04-01	58.8
2009-07-01	59.3
2009-10-01	58.9
2010-01-01	58.6
2010-04-01	58.9
2010-07-01	60.3
2010-10-01	60.4
2011-01-01	59.8
2011-04-01	60.5
2011-07-01	60.7
2011-10-01	60.0
2012-01-01	60.9
2012-04-01	61.4
2012-07-01	61.4
2012-10-01	60.9
2013-01-01	60.8
2013-04-01	61.3
2013-07-01	61.1
2013-10-01	61.2
2014-01-01	62.0
2014-04-01	62.2
2014-07-01	62.8
2014-10-01	62.4
2015-01-01	62.4
2015-04-01	63.2
2015-07-01	63.6
2015-10-01	63.8
2016-01-01	64.3
2016-04-01	64.7
2016-07-01	64.7
2016-10-01	64.8
2017-01-01	64.5
2017-04-01	65.7
2017-07-01	65.3
2017-10-01	65.4
2018-01-01	65.1
2018-04-01	65.4