Quarter	Percent
1999-01-01	49
1999-04-01	49.3
1999-07-01	49.8
1999-10-01	49.7
2000-01-01	49.3
2000-04-01	49.6
2000-07-01	50
2000-10-01	50.2
2001-01-01	49.1
2001-04-01	48.9
2001-07-01	49.2
2001-10-01	48.9
2002-01-01	48.7
2002-04-01	48.9
2002-07-01	49.3
2002-10-01	49.3
2003-01-01	49.2
2003-04-01	49.7
2003-07-01	50.1
2003-10-01	50
2004-01-01	49.6
2004-04-01	49.5
2004-07-01	49.8
2004-10-01	49.9
2005-01-01	49.7
2005-04-01	50
2005-07-01	50.5
2005-10-01	50.4
2006-01-01	50.3
2006-04-01	50.6
2006-07-01	50.8
2006-10-01	50.9
2007-01-01	50.2
2007-04-01	50.3
2007-07-01	50.5
2007-10-01	50.2
2008-01-01	49.5
2008-04-01	49.7
2008-07-01	50.4
2008-10-01	50
2009-01-01	49.5
2009-04-01	49.8
2009-07-01	50
2009-10-01	50.1
2010-01-01	50
2010-04-01	50.3
2010-07-01	50.7
2010-10-01	50.4
2011-01-01	50.1
2011-04-01	50.6
2011-07-01	51
2011-10-01	51
2012-01-01	50.9
2012-04-01	51.6
2012-07-01	52.2
2012-10-01	52
2013-01-01	51.3
2013-04-01	52.1
2013-07-01	52.6
2013-10-01	52.6
2014-01-01	53.1
2014-04-01	53.6
2014-07-01	54.1
2014-10-01	53.9
2015-01-01	54.1
2015-04-01	54.7
2015-07-01	55.2
2015-10-01	55.0
2016-01-01	55.1
2016-04-01	55.6
2016-07-01	56.1
2016-10-01	56.1
2017-01-01	55.7
2017-04-01	56.3
2017-07-01	56.6
2017-10-01	56.5
2018-01-01	56.4
2018-04-01	56.7