Quarter	Percent
1999-04-01	40.8
1999-07-01	36.3
1999-10-01	37.7
2000-01-01	38.6
2000-04-01	40.2
2000-07-01	36.4
2000-10-01	38.1
2001-01-01	40.3
2001-04-01	41.9
2001-07-01	38.2
2001-10-01	37.9
2002-01-01	40.1
2002-04-01	40.8
2002-07-01	37.3
2002-10-01	38.8
2003-01-01	40.5
2003-04-01	41.7
2003-07-01	38.6
2003-10-01	38.9
2004-01-01	39.8
2004-04-01	40.9
2004-07-01	38.1
2004-10-01	39.1
2005-01-01	40.3
2005-04-01	42.7
2005-07-01	39.4
2005-10-01	40.8
2006-01-01	41.7
2006-04-01	41.2
2006-07-01	38.4
2006-10-01	39.8
2007-01-01	42.2
2007-04-01	43.0
2007-07-01	39.4
2007-10-01	41.0
2008-01-01	42.7
2008-04-01	42.8
2008-07-01	40.1
2008-10-01	41.7
2009-01-01	43.1
2009-04-01	44.1
2009-07-01	41.2
2009-10-01	43.1
2010-01-01	45
2010-04-01	45
2010-07-01	42
2010-10-01	44.4
2011-01-01	45.7
2011-04-01	45.5
2011-07-01	42.5
2011-10-01	43.6
2012-01-01	45.6
2012-04-01	45.4
2012-07-01	41.9
2012-10-01	42
2013-01-01	44.2
2013-04-01	45.5
2013-07-01	41.5
2013-10-01	43.3
2014-01-01	45.5
2014-04-01	45.4
2014-07-01	41.7
2014-10-01	43.1
2015-01-01	44.3
2015-04-01	43.8
2015-07-01	41.1
2015-10-01	42.8
2016-01-01	43.8
2016-04-01	43.4
2016-07-01	40.6
2016-10-01	42.1
2017-01-01	43.4
2017-04-01	44.3
2017-07-01	41.8
2017-10-01	43.0
2018-01-01	44.3
2018-04-01	45.6