Quarter	Percent
1999-04-01	37
2000-01-01	41.3
2000-04-01	36.2
2000-07-01	33.5
2000-10-01	39.3
2001-01-01	43.2
2001-04-01	35.3
2001-07-01	34.7
2001-10-01	37.8
2002-01-01	38.5
2002-04-01	34
2002-07-01	32.9
2002-10-01	37.7
2003-01-01	40.7
2003-04-01	36.8
2003-07-01	35
2003-10-01	38.6
2004-01-01	41.2
2004-04-01	35.6
2004-07-01	34.8
2004-10-01	39.9
2005-01-01	44
2005-04-01	38.4
2005-07-01	36.5
2005-10-01	40.5
2006-01-01	44.7
2006-04-01	40.6
2006-07-01	38.4
2006-10-01	44.4
2007-01-01	43.5
2007-04-01	39.8
2007-07-01	37.3
2007-10-01	39
2008-01-01	37.2
2008-04-01	36
2008-07-01	36.9
2008-10-01	40.9
2009-01-01	40.5
2009-04-01	39.4
2009-07-01	40.1
2009-10-01	44.2
2010-01-01	44
2010-04-01	41.3
2010-07-01	43
2010-10-01	44.3
2011-01-01	44.4
2011-04-01	43.2
2011-07-01	41.6
2011-10-01	44.3
2012-01-01	44.8
2012-04-01	41.8
2012-07-01	39.8
2012-10-01	42.3
2013-01-01	40.6
2013-04-01	41.1
2013-07-01	41.7
2013-10-01	43.7
2014-01-01	45.6
2014-04-01	44
2014-07-01	42.9
2014-10-01	44.3
2015-01-01	45.2
2015-04-01	40.4
2015-07-01	41.7
2015-10-01	46.2
2016-01-01	44.9
2016-04-01	44.8
2016-07-01	42.5
2016-10-01	47.1
2017-01-01	48.5
2017-04-01	44.9
2017-07-01	44.1
2017-10-01	46.7
2018-01-01	47.9
2018-04-01	44.5