Quarter	Percent
1998-01-01	41.5
1999-01-01	41.6
1999-04-01	43.6
1999-07-01	39
1999-10-01	38.8
2000-01-01	43.9
2000-04-01	46.2
2000-07-01	43.3
2000-10-01	44.9
2001-01-01	45.3
2001-04-01	46.5
2001-07-01	44.7
2001-10-01	45.5
2002-01-01	44.3
2002-04-01	46
2002-07-01	44.2
2002-10-01	45.3
2003-01-01	45.3
2003-04-01	45.6
2003-07-01	43.9
2003-10-01	45.2
2004-01-01	44.3
2004-04-01	45
2004-07-01	41
2004-10-01	42.9
2005-01-01	43.8
2005-04-01	43.4
2005-07-01	38.6
2005-10-01	42.2
2006-01-01	43.9
2006-04-01	44.1
2006-07-01	38.2
2006-10-01	42
2007-01-01	42.4
2007-04-01	42.1
2007-07-01	36.6
2007-10-01	41.2
2008-01-01	41.7
2008-04-01	43
2008-07-01	37.7
2008-10-01	39.5
2009-01-01	41.8
2009-04-01	42.4
2009-07-01	36.9
2009-10-01	40.9
2010-01-01	43
2010-04-01	44.3
2010-07-01	38.7
2010-10-01	40.9
2011-01-01	41.7
2011-04-01	42.4
2011-07-01	37.7
2011-10-01	41.4
2012-01-01	42.5
2012-04-01	42.4
2012-07-01	37.2
2012-10-01	40.9
2013-01-01	42.6
2013-04-01	42.5
2013-07-01	38.1
2013-10-01	41.7
2014-01-01	42.4
2014-04-01	43.9
2014-07-01	39.5
2014-10-01	42.1
2015-01-01	43.9
2015-04-01	44.2
2015-07-01	38.8
2015-10-01	43.3
2016-01-01	44.1
2016-04-01	44.7
2016-07-01	38.3
2016-10-01	43.0
2017-01-01	44.8
2017-04-01	45.1
2017-07-01	41.5
2017-10-01	44.3
2018-01-01	45.8
2018-04-01	44.9