Quarter	Percent
1999-04-01	53
2000-01-01	53.2
2000-04-01	54.1
2000-07-01	54.9
2000-10-01	55.2
2001-01-01	54.9
2001-04-01	55.1
2001-07-01	55.4
2001-10-01	55.6
2002-01-01	55.9
2002-04-01	55.9
2002-07-01	56.6
2002-10-01	56.7
2003-01-01	56.7
2003-04-01	56.5
2003-07-01	56.7
2003-10-01	56.4
2004-01-01	56.7
2004-04-01	56.9
2004-07-01	57
2004-10-01	57.1
2005-01-01	57.1
2005-04-01	57.5
2005-07-01	57.5
2005-10-01	57.7
2006-01-01	57.9
2006-04-01	57.9
2006-07-01	58
2006-10-01	58.5
2007-01-01	58.9
2007-04-01	59.3
2007-07-01	59.3
2007-10-01	59.4
2008-01-01	59.5
2008-04-01	59.7
2008-07-01	60.1
2008-10-01	60.3
2009-01-01	60.8
2009-04-01	60.3
2009-07-01	60.3
2009-10-01	60.3
2010-01-01	58.7
2010-04-01	59
2010-07-01	58.9
2010-10-01	59
2011-01-01	58.6
2011-04-01	58.5
2011-07-01	58.6
2011-10-01	59.3
2012-01-01	59.1
2012-04-01	59.2
2012-07-01	59.4
2012-10-01	59.5
2013-01-01	59.3
2013-04-01	59.3
2013-07-01	59.3
2013-10-01	59.1
2014-01-01	58.4
2014-04-01	58.2
2014-07-01	58.4
2014-10-01	58.8
2015-01-01	58.8
2015-04-01	58.9
2015-07-01	58.8
2015-10-01	58.6
2016-01-01	58.4
2016-04-01	58.8
2016-07-01	58.8
2016-10-01	58.7
2017-01-01	58.7
2017-04-01	58.8
2017-07-01	59.0
2017-10-01	58.7
2018-01-01	58.6
2018-04-01	59.0