Quarter	Percent
1999-04-01	43.9
2000-04-01	43.6
2001-04-01	44.3
2002-04-01	43.8
2003-04-01	43
2004-04-01	39.8
2005-01-01	40.2
2005-04-01	39.5
2005-07-01	39.4
2005-10-01	41.5
2006-01-01	41.3
2006-04-01	41
2006-07-01	41.3
2006-10-01	43
2007-01-01	43.5
2007-04-01	42.4
2007-07-01	43.4
2007-10-01	44.9
2008-01-01	45.4
2008-04-01	44
2008-07-01	43.6
2008-10-01	45.2
2009-01-01	44.7
2009-04-01	44.1
2009-07-01	43.4
2009-10-01	45.3
2010-01-01	43.9
2010-04-01	43.6
2010-07-01	44.7
2010-10-01	45.8
2011-01-01	45.1
2011-04-01	46
2011-07-01	46.5
2011-10-01	46.7
2012-01-01	43.9
2012-04-01	44.5
2012-07-01	44.3
2012-10-01	45.3
2013-01-01	45.5
2013-04-01	44.6
2013-07-01	44.7
2013-10-01	46.1
2014-01-01	44.5
2014-04-01	43.7
2014-07-01	44.1
2014-10-01	45
2015-01-01	44.8
2015-04-01	43.3
2015-07-01	43.0
2015-10-01	44.9
2016-01-01	43.7
2016-04-01	43.2
2016-07-01	45.2
2016-10-01	45.7
2017-01-01	44.8
2017-04-01	44.2
2017-07-01	45.7
2017-10-01	47.3
2018-01-01	45.0
2018-04-01	43.7