Quarter	Percent
1999-04-01	68.1
2000-04-01	69.4
2001-04-01	67.9
2002-04-01	68.8
2003-01-01	70.3
2003-04-01	70.3
2003-07-01	70.3
2003-10-01	70.3
2004-01-01	73.6
2004-04-01	73.6
2004-07-01	73.6
2004-10-01	73.6
2005-01-01	74.5
2005-04-01	74.5
2005-07-01	74.5
2005-10-01	74.5
2006-01-01	75
2006-04-01	75
2006-07-01	75
2006-10-01	75
2007-01-01	79
2007-04-01	83.2
2007-07-01	74.2
2007-10-01	74.4
2008-01-01	77.5
2008-04-01	74.7
2008-07-01	70.8
2008-10-01	68.5
2009-01-01	75.2
2009-04-01	69.2
2009-07-01	70.2
2009-10-01	67.8
2010-01-01	80.5
2010-04-01	77.5
2010-07-01	74.5
2010-10-01	76.9
2011-01-01	74.1
2011-04-01	80.7
2011-07-01	75.1
2011-10-01	76.6
2012-01-01	78.1
2012-04-01	80.2
2012-07-01	71.7
2012-10-01	71.5
2013-01-01	78.2
2013-04-01	77.4
2013-07-01	82.3
2013-10-01	75
2014-01-01	71.3
2014-04-01	80.1
2014-07-01	77.2
2014-10-01	79.4
2015-01-01	64.7
2015-04-01	68.1
2015-07-01	60.7
2015-10-01	69.9
2016-01-01	73.1
2016-04-01	68.9
2016-07-01	62.0
2016-10-01	71.8
2017-01-01	70.3
2017-04-01	77.2
2017-07-01	67.9
2017-10-01	71.5
2018-01-01	70.2
2018-04-01	73.0