Quarter	Percent
1999-04-01	13
2000-01-01	17.3
2000-04-01	15.3
2000-07-01	15.8
2000-10-01	16.6
2001-01-01	15.1
2001-04-01	13.1
2001-07-01	13.8
2001-10-01	14
2002-01-01	13.2
2002-04-01	11.4
2002-07-01	10.3
2002-10-01	15.1
2003-01-01	13.1
2003-04-01	12.4
2003-07-01	10
2003-10-01	8.8
2004-01-01	11.8
2004-04-01	12
2004-07-01	12
2004-10-01	9.7
2005-01-01	11.9
2005-04-01	10.8
2005-07-01	7.0
2005-10-01	7.8
2006-01-01	7.8
2006-04-01	6.3
2006-07-01	5.2
2006-10-01	6.1
2007-01-01	6.7
2007-04-01	5.8
2007-07-01	4.8
2007-10-01	4.7
2008-01-01	3.6
2008-04-01	4.5
2008-07-01	7.1
2008-10-01	8.3
2009-01-01	14
2009-04-01	16.9
2009-07-01	17.4
2009-10-01	20.4
2010-01-01	25.7
2010-04-01	22.8
2010-07-01	16
2010-10-01	14.4
2011-01-01	15.7
2011-04-01	14.1
2011-07-01	10.8
2011-10-01	12.7
2012-01-01	13
2012-04-01	11.7
2012-07-01	9.7
2012-10-01	10.2
2013-01-01	11
2013-04-01	8.3
2013-07-01	8.1
2013-10-01	9.4
2014-01-01	9.5
2014-04-01	7.8
2014-07-01	8.4
2014-10-01	6.3
2015-01-01	7.7
2015-04-01	6.7
2015-07-01	4.7
2015-10-01	6.2
2016-01-01	7.5
2016-04-01	7.8
2016-07-01	7.6
2016-10-01	7.3
2017-01-01	6.1
2017-04-01	7.9
2017-07-01	6.0
2017-10-01	5.4
2018-01-01	7.6
2018-04-01	5.1