Quarter	Percent
1999-04-01	37
2000-01-01	37.3
2000-04-01	37.5
2000-07-01	43.1
2000-10-01	40.6
2001-01-01	36.4
2001-04-01	36.3
2001-07-01	40.4
2001-10-01	38
2002-01-01	32
2002-04-01	31.9
2002-07-01	37.5
2002-10-01	37.8
2003-01-01	33
2003-04-01	39.4
2003-07-01	44.8
2003-10-01	38.4
2004-01-01	35.1
2004-04-01	39.9
2004-07-01	40.1
2004-10-01	34.9
2005-01-01	33.6
2005-04-01	38.3
2005-07-01	36.9
2005-10-01	36.1
2006-01-01	34.9
2006-04-01	36.1
2006-07-01	35.4
2006-10-01	36.4
2007-01-01	36.4
2007-04-01	37.8
2007-07-01	40.3
2007-10-01	37.1
2008-01-01	38.2
2008-04-01	37.3
2008-07-01	43.5
2008-10-01	44.5
2009-01-01	40.3
2009-04-01	38.8
2009-07-01	42.5
2009-10-01	34.6
2010-01-01	38.2
2010-04-01	38
2010-07-01	38.7
2010-10-01	36.2
2011-01-01	37.1
2011-04-01	40.8
2011-07-01	44.4
2011-10-01	37.8
2012-01-01	40.6
2012-04-01	41.3
2012-07-01	42.6
2012-10-01	38.6
2013-01-01	39.2
2013-04-01	40.4
2013-07-01	40.3
2013-10-01	39.2
2014-01-01	38
2014-04-01	40.1
2014-07-01	40.5
2014-10-01	38.2
2015-01-01	39.4
2015-04-01	44.7
2015-07-01	43.8
2015-10-01	39.1
2016-01-01	38.3
2016-04-01	44.0
2016-07-01	48.2
2016-10-01	42.6
2017-01-01	44.4
2017-04-01	46.1
2017-07-01	47.4
2017-10-01	46.5
2018-01-01	47.7
2018-04-01	49.2