Quarter	Percent
1999-04-01	64
2000-04-01	62.6
2001-04-01	63.2
2002-04-01	61.8
2003-01-01	69
2003-04-01	69
2003-07-01	69
2003-10-01	69
2004-01-01	70.4
2004-04-01	70.4
2004-07-01	70.4
2004-10-01	70.4
2005-01-01	67.9
2005-04-01	67.9
2005-07-01	67.9
2005-10-01	67.9
2006-01-01	69.4
2006-04-01	69.4
2006-07-01	69.4
2006-10-01	69.4
2007-01-01	67.7
2007-04-01	64.5
2007-07-01	71
2007-10-01	74.3
2008-01-01	69.7
2008-04-01	64.9
2008-07-01	72.1
2008-10-01	70.1
2009-01-01	71.2
2009-04-01	62.9
2009-07-01	64.3
2009-10-01	61.9
2010-01-01	73.7
2010-04-01	76
2010-07-01	70.5
2010-10-01	72.5
2011-01-01	71.7
2011-04-01	77
2011-07-01	72
2011-10-01	73.9
2012-01-01	72.5
2012-04-01	75.2
2012-07-01	69.8
2012-10-01	67.4
2013-01-01	76.3
2013-04-01	71.6
2013-07-01	68.5
2013-10-01	64.2
2014-01-01	69.8
2014-04-01	73.6
2014-07-01	70.3
2014-10-01	67.7
2015-01-01	65.6
2015-04-01	65.9
2015-07-01	57.8
2015-10-01	65.9
2016-01-01	72.4
2016-04-01	71.0
2016-07-01	68.8
2016-10-01	66.3
2017-01-01	68.7
2017-04-01	68.3
2017-07-01	64.5
2017-10-01	68.2
2018-01-01	66.0
2018-04-01	70.4