Quarter	Percent
1999-04-01	57
2000-01-01	57.7
2000-04-01	56.8
2000-07-01	53.6
2000-10-01	53
2001-01-01	54.7
2001-04-01	61.2
2001-07-01	56.2
2001-10-01	53
2002-01-01	58.6
2002-04-01	62.6
2002-07-01	57.2
2002-10-01	55.7
2003-01-01	60.8
2003-04-01	51.5
2003-07-01	48.3
2003-10-01	58.7
2004-01-01	57.8
2004-04-01	53
2004-07-01	49.6
2004-10-01	58.8
2005-01-01	62.3
2005-04-01	58.7
2005-07-01	57.6
2005-10-01	56.8
2006-01-01	59.4
2006-04-01	59.9
2006-07-01	59
2006-10-01	58.3
2007-01-01	57.5
2007-04-01	55.8
2007-07-01	53.8
2007-10-01	58.8
2008-01-01	58.1
2008-04-01	57.9
2008-07-01	52.6
2008-10-01	53.4
2009-01-01	56.5
2009-04-01	55.9
2009-07-01	51.7
2009-10-01	60.7
2010-01-01	56.4
2010-04-01	59.6
2010-07-01	58.4
2010-10-01	61
2011-01-01	58.4
2011-04-01	56.7
2011-07-01	52.4
2011-10-01	58.8
2012-01-01	57.8
2012-04-01	55.5
2012-07-01	52.7
2012-10-01	56.9
2013-01-01	58.6
2013-04-01	59.6
2013-07-01	56.5
2013-10-01	59.8
2014-01-01	59.6
2014-04-01	57.8
2014-07-01	57.4
2014-10-01	59.7
2015-01-01	58.5
2015-04-01	48.8
2015-07-01	49.5
2015-10-01	60.5
2016-01-01	56.5
2016-04-01	54.6
2016-07-01	49.0
2016-10-01	55.5
2017-01-01	52.6
2017-04-01	50.1
2017-07-01	48.6
2017-10-01	49.9
2018-01-01	49.2
2018-04-01	48.5