Quarter	Percent
2005-01-01	70.9
2005-04-01	69.9
2005-07-01	70.1
2005-10-01	70.6
2006-01-01	70.8
2006-04-01	71.2
2006-07-01	69.1
2006-10-01	72.3
2007-01-01	71.5
2007-04-01	67.3
2007-07-01	66.8
2007-10-01	67.9
2008-01-01	67.0
2008-04-01	64.4
2008-07-01	63.5
2008-10-01	66.7
2009-01-01	65.5
2009-04-01	65.4
2009-07-01	68.6
2009-10-01	69.9
2010-01-01	69.1
2010-04-01	70.6
2010-07-01	68.6
2010-10-01	66.4
2011-01-01	67.3
2011-04-01	68.0
2011-07-01	67.7
2011-10-01	68.8
2012-01-01	71.0
2012-04-01	68.2
2012-07-01	66.0
2012-10-01	65.3
2013-01-01	65.4
2013-04-01	65.7
2013-07-01	62.2
2013-10-01	63.6
2014-01-01	63.5
2014-04-01	61.5
2014-07-01	58.8
2014-10-01	61.8
2015-01-01	62.8
2015-04-01	63.2
2015-07-01	63.9
2015-10-01	63.2
2016-01-01	64.2
2016-04-01	60.4
2016-07-01	60.0
2016-10-01	60.5
2017-01-01	61.2
2017-04-01	61.6
2017-07-01	62.4
2017-10-01	63.8
2018-01-01	62.7
2018-04-01	63.0