Quarter	Percent
1998-04-01	50.2
1998-10-01	49.7
1999-04-01	49.6
1999-10-01	47.9
2000-04-01	44.8
2000-10-01	42.0
2001-04-01	43.4
2001-10-01	39.8
2002-01-01	41.6
2002-04-01	41.7
2002-07-01	47.1
2002-10-01	46.4
2003-01-01	43.2
2003-04-01	45.2
2003-07-01	44.1
2003-10-01	43.6
2004-01-01	43.2
2004-04-01	43.1
2004-07-01	45.1
2004-10-01	44.2
2005-01-01	44.9
2005-04-01	41.0
2005-07-01	45.9
2005-10-01	43.7
2006-01-01	46.5
2006-04-01	44.2
2006-07-01	51.5
2006-10-01	47.8
2007-01-01	48.3
2007-04-01	47.1
2007-07-01	52.6
2007-10-01	48.7
2008-01-01	49.9
2008-04-01	47.9
2008-07-01	51.2
2008-10-01	46.9
2009-01-01	47.5
2009-04-01	47.0
2009-07-01	47.6
2009-10-01	43.5
2010-01-01	45.8
2010-04-01	41.4
2010-07-01	43.2
2010-10-01	38.5
2011-01-01	40.3
2011-04-01	42.0
2011-07-01	42.1
2011-10-01	40.1
2012-01-01	41.8
2012-04-01	43.9
2012-07-01	47.5
2012-10-01	42.8
2013-01-01	43.1
2013-04-01	40.2
2013-07-01	43.2
2013-10-01	43.7
2014-01-01	44.3
2014-04-01	43.0
2014-07-01	48.1
2014-10-01	45.9
2015-01-01	41.8
2015-04-01	45.4
2015-07-01	45.5
2015-10-01	48.3
2016-01-01	42.4
2016-04-01	44.8
2016-07-01	46.1
2016-10-01	39.5
2017-01-01	39.7
2017-04-01	44.9
2017-07-01	46.2
2017-10-01	40.5
2018-01-01	37.4
2018-04-01	39.5