Quarter	Percent
2005-01-01	75.1
2005-04-01	74.7
2005-07-01	74.4
2005-10-01	75.1
2006-01-01	74.1
2006-04-01	73.2
2006-07-01	72.8
2006-10-01	74.7
2007-01-01	74.3
2007-04-01	72.2
2007-07-01	71.7
2007-10-01	73.6
2008-01-01	71.6
2008-04-01	70.5
2008-07-01	67.7
2008-10-01	70.1
2009-01-01	70.4
2009-04-01	70.0
2009-07-01	70.7
2009-10-01	71.7
2010-01-01	71.9
2010-04-01	74.1
2010-07-01	71.0
2010-10-01	69.3
2011-01-01	71.6
2011-04-01	72.5
2011-07-01	70.8
2011-10-01	72.4
2012-01-01	73.0
2012-04-01	71.2
2012-07-01	69.3
2012-10-01	69.3
2013-01-01	69.6
2013-04-01	69.5
2013-07-01	66.3
2013-10-01	68.6
2014-01-01	67.1
2014-04-01	66.3
2014-07-01	64.1
2014-10-01	65.7
2015-01-01	67.0
2015-04-01	66.5
2015-07-01	66.3
2015-10-01	64.8
2016-01-01	66.0
2016-04-01	65.3
2016-07-01	63.1
2016-10-01	64.2
2017-01-01	65.6
2017-04-01	63.7
2017-07-01	64.6
2017-10-01	66.0
2018-01-01	65.1
2018-04-01	65.1