Quarter	Percent
1999-04-01	71.8
2000-04-01	77.3
2001-04-01	79.9
2002-04-01	71.4
2003-01-01	66.5
2003-04-01	80.4
2003-07-01	81.4
2003-10-01	65.8
2004-01-01	63.5
2004-04-01	79.3
2004-07-01	78.3
2004-10-01	66.6
2005-01-01	68.1
2005-04-01	82.8
2005-07-01	80.2
2005-10-01	73.3
2006-01-01	70.9
2006-04-01	86.8
2006-07-01	82.8
2006-10-01	73.6
2007-01-01	74.7
2007-04-01	85.9
2007-07-01	83.2
2007-10-01	75.5
2008-01-01	73.2
2008-04-01	84.4
2008-07-01	82.4
2008-10-01	72.4
2009-01-01	66
2009-04-01	81.7
2009-07-01	78
2009-10-01	66.6
2010-01-01	66.4
2010-04-01	84.4
2010-07-01	76
2010-10-01	67.9
2011-01-01	66.8
2011-04-01	85
2011-07-01	74.7
2011-10-01	65.7
2012-01-01	68.5
2012-04-01	84.4
2012-07-01	78.9
2012-10-01	70.9
2013-01-01	69.4
2013-04-01	85.1
2013-07-01	82.7
2013-10-01	74.8
2014-01-01	74.2
2014-04-01	84.3
2014-07-01	81.3
2014-10-01	72.9
2015-01-01	75.0
2015-04-01	87.0
2015-07-01	83.1
2015-10-01	75.5
2016-01-01	77.2
2016-04-01	90.1
2016-07-01	86.4
2016-10-01	78.2
2017-01-01	79.7
2017-04-01	91.8
2017-07-01	82.0
2017-10-01	75.5
2018-01-01	75.0
2018-04-01	86.5