Quarter	Percent
1999-01-01	62
1999-04-01	62.3
1999-07-01	60.2
1999-10-01	59.5
2000-01-01	60.6
2000-04-01	60.6
2000-07-01	59.5
2000-10-01	60.5
2001-01-01	63.2
2001-04-01	62.8
2001-07-01	61.2
2001-10-01	62.1
2002-01-01	61.9
2002-04-01	61.5
2002-07-01	59.8
2002-10-01	60.8
2003-01-01	61.4
2003-04-01	60.8
2003-07-01	59
2003-10-01	60.6
2004-01-01	60.8
2004-04-01	60.2
2004-07-01	58.6
2004-10-01	60.4
2005-01-01	59
2005-04-01	56.6
2005-07-01	54.9
2005-10-01	57.4
2006-01-01	57.1
2006-04-01	55.5
2006-07-01	54.8
2006-10-01	56.7
2007-01-01	58.4
2007-04-01	57
2007-07-01	53.8
2007-10-01	57.3
2008-01-01	58.2
2008-04-01	56
2008-07-01	54.1
2008-10-01	56.7
2009-01-01	58.1
2009-04-01	58.4
2009-07-01	56.3
2009-10-01	60.3
2010-01-01	60.5
2010-04-01	60
2010-07-01	57.7
2010-10-01	60.8
2011-01-01	61.5
2011-04-01	60.6
2011-07-01	58.6
2011-10-01	62.4
2012-01-01	62.6
2012-04-01	61.8
2012-07-01	61.1
2012-10-01	63.9
2013-01-01	64
2013-04-01	64.7
2013-07-01	62.6
2013-10-01	65.1
2014-01-01	66.3
2014-04-01	66.8
2014-07-01	65
2014-10-01	65.9
2015-01-01	67.9
2015-04-01	66.3
2015-07-01	64.6
2015-10-01	68.5
2016-01-01	69.6
2016-04-01	68.5
2016-07-01	66.8
2016-10-01	70.0
2017-01-01	70.3
2017-04-01	68.9
2017-07-01	66.6
2017-10-01	68.3
2018-01-01	71.0
2018-04-01	69.3
2018-07-01	67.5