Quarter	Percent
1999-04-01	66
2000-04-01	66
2001-04-01	65.5
2002-04-01	65.3
2003-01-01	69.6
2003-04-01	69.6
2003-07-01	69.6
2003-10-01	69.6
2004-01-01	72
2004-04-01	72
2004-07-01	72
2004-10-01	72
2005-01-01	71.2
2005-04-01	71.2
2005-07-01	71.2
2005-10-01	71.2
2006-01-01	72.2
2006-04-01	72.2
2006-07-01	72.2
2006-10-01	72.2
2007-01-01	73.4
2007-04-01	73.7
2007-07-01	72.6
2007-10-01	74.3
2008-01-01	73.5
2008-04-01	69.7
2008-07-01	71.5
2008-10-01	69.3
2009-01-01	73.1
2009-04-01	66
2009-07-01	67.2
2009-10-01	64.7
2010-01-01	77.1
2010-04-01	76.7
2010-07-01	72.5
2010-10-01	74.7
2011-01-01	72.9
2011-04-01	78.8
2011-07-01	73.5
2011-10-01	75.3
2012-01-01	75.3
2012-04-01	77.6
2012-07-01	70.7
2012-10-01	69.4
2013-01-01	77.2
2013-04-01	74.4
2013-07-01	75.2
2013-10-01	69.5
2014-01-01	70.6
2014-04-01	76.8
2014-07-01	73.7
2014-10-01	73.6
2015-01-01	65.2
2015-04-01	67.0
2015-07-01	59.3
2015-10-01	67.9
2016-01-01	72.8
2016-04-01	70.0
2016-07-01	65.4
2016-10-01	69.0
2017-01-01	69.5
2017-04-01	72.6
2017-07-01	66.2
2017-10-01	69.8
2018-01-01	68.1
2018-04-01	71.7