Quarter	Percent
1999-01-01	70.6
1999-04-01	71.6
1999-07-01	72
1999-10-01	70.3
2000-01-01	71.9
2000-04-01	72.1
2000-07-01	71
2000-10-01	71.5
2001-01-01	70.9
2001-04-01	71.4
2001-07-01	72.8
2001-10-01	73
2002-01-01	71.5
2002-04-01	72.6
2002-07-01	71.3
2002-10-01	71.4
2003-01-01	69.2
2003-04-01	70.5
2003-07-01	71.5
2003-10-01	70.9
2004-01-01	69.9
2004-04-01	72
2004-07-01	72.8
2004-10-01	71.6
2005-01-01	71.1
2005-04-01	70.8
2005-07-01	72.1
2005-10-01	73.6
2006-01-01	72.9
2006-04-01	73.2
2006-07-01	74.1
2006-10-01	73.6
2007-01-01	72.9
2007-04-01	73.3
2007-07-01	73.3
2007-10-01	73.2
2008-01-01	73.1
2008-04-01	74.1
2008-07-01	74.5
2008-10-01	74.6
2009-01-01	73.1
2009-04-01	73.3
2009-07-01	73.3
2009-10-01	71.1
2010-01-01	71
2010-04-01	72
2010-07-01	71.6
2010-10-01	69.8
2011-01-01	69.9
2011-04-01	70.8
2011-07-01	71
2011-10-01	69.9
2012-01-01	69.8
2012-04-01	70.5
2012-07-01	70.4
2012-10-01	69.2
2013-01-01	69.2
2013-04-01	70.6
2013-07-01	71
2013-10-01	69.4
2014-01-01	68.3
2014-04-01	69.6
2014-07-01	70.5
2014-10-01	70.8
2015-01-01	70.3
2015-04-01	70.3
2015-07-01	70.3
2015-10-01	70.5
2016-01-01	71.9
2016-04-01	72.7
2016-07-01	71.9
2016-10-01	71.5
2017-01-01	70.9
2017-04-01	71.3
2017-07-01	72.3
2017-10-01	71.6
2018-01-01	72.0
2018-04-01	73.0