Quarter	Percent
2000-04-01	70.4
2001-04-01	69.9
2002-04-01	69.2
2003-04-01	67.3
2004-04-01	66.4
2005-01-01	64.8
2005-04-01	64.1
2005-07-01	64.1
2005-10-01	63.7
2006-01-01	63.6
2006-04-01	63
2006-07-01	62.4
2006-10-01	62.6
2007-01-01	62.8
2007-04-01	61.9
2007-07-01	62.0
2007-10-01	61.8
2008-01-01	62.2
2008-04-01	61.3
2008-07-01	61.1
2008-10-01	61.0
2009-01-01	60.6
2009-04-01	59.6
2009-07-01	60.0
2009-10-01	59.8
2010-01-01	59.5
2010-04-01	59.2
2010-07-01	58.7
2010-10-01	58.7
2011-01-01	58.1
2011-04-01	57.5
2011-07-01	57.2
2011-10-01	56.9
2012-01-01	56.4
2012-04-01	55.4
2012-07-01	55.0
2012-10-01	54.8
2013-01-01	54.4
2013-04-01	53.7
2013-07-01	53.1
2013-10-01	52.7
2014-01-01	52.4
2014-04-01	51.7
2014-07-01	51.3
2014-10-01	50.9
2015-01-01	50.8
2015-04-01	50.1
2015-07-01	49.7
2015-10-01	49.4
2016-01-01	48.8
2016-04-01	47.9
2016-07-01	47.8
2016-10-01	47.5
2017-01-01	47.1
2017-04-01	46.1
2017-07-01	46.0
2017-10-01	45.7
2018-01-01	45.4
2018-04-01	44.9