Quarter	Percent
2000-04-01	68.5
2001-04-01	68.5
2002-04-01	68.6
2003-04-01	68.9
2004-04-01	69.2
2005-01-01	69.4
2005-04-01	69.7
2005-07-01	70
2005-10-01	69.9
2006-01-01	69.8
2006-04-01	70.1
2006-07-01	70.6
2006-10-01	70.3
2007-01-01	69.9
2007-04-01	70.3
2007-07-01	70.8
2007-10-01	70.5
2008-01-01	70.3
2008-04-01	70.7
2008-07-01	71.1
2008-10-01	70.8
2009-01-01	70.6
2009-04-01	70.9
2009-07-01	71.0
2009-10-01	70.8
2010-01-01	70.7
2010-04-01	71.0
2010-07-01	71.2
2010-10-01	71
2011-01-01	70.8
2011-04-01	71.1
2011-07-01	71.3
2011-10-01	71.3
2012-01-01	71.2
2012-04-01	71.6
2012-07-01	72.0
2012-10-01	71.9
2013-01-01	71.6
2013-04-01	72.0
2013-07-01	72.2
2013-10-01	72.1
2014-01-01	72.0
2014-04-01	72.2
2014-07-01	72.5
2014-10-01	72.5
2015-01-01	72.2
2015-04-01	72.5
2015-07-01	72.7
2015-10-01	72.7
2016-01-01	72.5
2016-04-01	72.9
2016-07-01	73.2
2016-10-01	73.1
2017-01-01	72.9
2017-04-01	73.4
2017-07-01	73.6
2017-10-01	73.5
2018-01-01	73.3
2018-04-01	73.7