Quarter	Percent
1999-04-01	69
2000-01-01	67.8
2000-04-01	68.5
2000-07-01	60.2
2000-10-01	66
2001-01-01	73.3
2001-04-01	66.7
2001-07-01	63.1
2001-10-01	71.5
2002-01-01	77.8
2002-04-01	73.9
2002-07-01	68.1
2002-10-01	69.1
2003-01-01	73.7
2003-04-01	69.9
2003-07-01	62.3
2003-10-01	64.6
2004-01-01	72.1
2004-04-01	67.5
2004-07-01	70.6
2004-10-01	71.7
2005-01-01	70.7
2005-04-01	64.8
2005-07-01	68.8
2005-10-01	71.4
2006-01-01	71
2006-04-01	68.1
2006-07-01	70.4
2006-10-01	69.1
2007-01-01	69.8
2007-04-01	68.9
2007-07-01	65.8
2007-10-01	67.1
2008-01-01	65.7
2008-04-01	67.7
2008-07-01	60.6
2008-10-01	57.7
2009-01-01	62.9
2009-04-01	66.7
2009-07-01	63.6
2009-10-01	70.4
2010-01-01	67.4
2010-04-01	64.5
2010-07-01	64.2
2010-10-01	66.9
2011-01-01	67.6
2011-04-01	61.9
2011-07-01	58.9
2011-10-01	65.6
2012-01-01	61
2012-04-01	62
2012-07-01	62.1
2012-10-01	66
2013-01-01	62.9
2013-04-01	59.5
2013-07-01	63
2013-10-01	61.8
2014-01-01	64.5
2014-04-01	62.1
2014-07-01	61.6
2014-10-01	63.8
2015-01-01	62.8
2015-04-01	62.0
2015-07-01	63.1
2015-10-01	61.4
2016-01-01	67.0
2016-04-01	57.5
2016-07-01	54.6
2016-10-01	59.4
2017-01-01	58.7
2017-04-01	57.8
2017-07-01	56.7
2017-10-01	57.1
2018-01-01	55.4
2018-04-01	53.2