Quarter	Percent
1999-04-01	74.9
2000-04-01	80.5
2001-04-01	79.5
2002-04-01	70.4
2003-01-01	67.1
2003-04-01	76.3
2003-07-01	80.3
2003-10-01	62.1
2004-01-01	63.8
2004-04-01	75.7
2004-07-01	79.4
2004-10-01	69.2
2005-01-01	73.4
2005-04-01	83.3
2005-07-01	79.3
2005-10-01	76.2
2006-01-01	76.5
2006-04-01	88
2006-07-01	83.5
2006-10-01	73.1
2007-01-01	75.9
2007-04-01	85
2007-07-01	82.2
2007-10-01	74.7
2008-01-01	75.6
2008-04-01	83.2
2008-07-01	82
2008-10-01	76.9
2009-01-01	68.1
2009-04-01	81.4
2009-07-01	79.5
2009-10-01	73
2010-01-01	66.8
2010-04-01	87.4
2010-07-01	78.4
2010-10-01	71.8
2011-01-01	69.6
2011-04-01	88.5
2011-07-01	74.2
2011-10-01	65.8
2012-01-01	72.2
2012-04-01	84.1
2012-07-01	80.5
2012-10-01	75.2
2013-01-01	73.5
2013-04-01	87.7
2013-07-01	84.3
2013-10-01	80.4
2014-01-01	76.9
2014-04-01	84.0
2014-07-01	82.0
2014-10-01	72.2
2015-01-01	77.6
2015-04-01	87.9
2015-07-01	82.8
2015-10-01	79.5
2016-01-01	77.6
2016-04-01	92.3
2016-07-01	84.8
2016-10-01	79.1
2017-01-01	82.4
2017-04-01	91.1
2017-07-01	80.2
2017-10-01	75.6
2018-01-01	76.2
2018-04-01	87.3