Quarter	Percent
2005-01-01	65.5
2005-04-01	65.2
2005-07-01	65.0
2005-10-01	65.1
2006-01-01	64.5
2006-04-01	64.9
2006-07-01	65.2
2006-10-01	64.0
2007-01-01	65.0
2007-04-01	65.4
2007-07-01	65.6
2007-10-01	63.5
2008-01-01	64.2
2008-04-01	64.0
2008-07-01	66.9
2008-10-01	66.8
2009-01-01	66.8
2009-04-01	67.5
2009-07-01	68.3
2009-10-01	68.0
2010-01-01	67.5
2010-04-01	67.7
2010-07-01	69.6
2010-10-01	69.8
2011-01-01	69.0
2011-04-01	69.4
2011-07-01	69.9
2011-10-01	69.2
2012-01-01	69.9
2012-04-01	70.2
2012-07-01	70.2
2012-10-01	69.9
2013-01-01	70.1
2013-04-01	70.5
2013-07-01	70.2
2013-10-01	70.3
2014-01-01	71.4
2014-04-01	71.5
2014-07-01	71.8
2014-10-01	71.6
2015-01-01	71.6
2015-04-01	72.5
2015-07-01	72.8
2015-10-01	73.2
2016-01-01	73.4
2016-04-01	74.0
2016-07-01	74.1
2016-10-01	74.1
2017-01-01	73.6
2017-04-01	75.0
2017-07-01	74.8
2017-10-01	75.0
2018-01-01	74.5
2018-04-01	74.8