Quarter	Percent
1999-04-01	64.6
2000-01-01	66.2
2000-04-01	54.4
2000-07-01	65.9
2000-10-01	61.2
2001-01-01	55.5
2001-04-01	57.9
2001-07-01	62.1
2001-10-01	62.4
2002-01-01	63.3
2002-04-01	60.4
2002-07-01	57.2
2002-10-01	61.1
2003-01-01	60.3
2003-04-01	58.3
2003-07-01	58.2
2003-10-01	66.3
2004-01-01	59.7
2004-04-01	52.1
2004-07-01	56.1
2004-10-01	64
2005-01-01	63.7
2005-04-01	60.3
2005-07-01	56.8
2005-10-01	61.3
2006-01-01	63.5
2006-04-01	64
2006-07-01	58.5
2006-10-01	59.8
2007-01-01	63.2
2007-04-01	63.2
2007-07-01	60.8
2007-10-01	66.3
2008-01-01	67.5
2008-04-01	65
2008-07-01	67.4
2008-10-01	73.2
2009-01-01	67.6
2009-04-01	66.2
2009-07-01	66.1
2009-10-01	69.1
2010-01-01	62.6
2010-04-01	62.3
2010-07-01	63.1
2010-10-01	69.3
2011-01-01	68.6
2011-04-01	62.8
2011-07-01	64.9
2011-10-01	71.9
2012-01-01	65.7
2012-04-01	63
2012-07-01	64.5
2012-10-01	68.1
2013-01-01	67.3
2013-04-01	67.4
2013-07-01	65.8
2013-10-01	67.1
2014-01-01	65.6
2014-04-01	70.7
2014-07-01	69.8
2014-10-01	70.5
2015-01-01	67.8
2015-04-01	65.0
2015-07-01	69.8
2015-10-01	68.4
2016-01-01	65.4
2016-04-01	74.7
2016-07-01	73.8
2016-10-01	67.7
2017-01-01	71.5
2017-04-01	73.7
2017-07-01	72.0
2017-10-01	70.7
2018-01-01	69.3
2018-04-01	70.1