Quarter	Percent
1999-01-01	9.9
2000-01-01	13.1
2000-04-01	12.3
2000-07-01	11.3
2000-10-01	11.7
2001-01-01	14.2
2001-04-01	14.2
2001-07-01	13.4
2001-10-01	14.5
2002-01-01	16.8
2002-04-01	16.5
2002-07-01	15.7
2002-10-01	16.1
2003-01-01	17.4
2003-04-01	16.3
2003-07-01	15.5
2003-10-01	15.8
2004-01-01	17.6
2004-04-01	16.1
2004-07-01	15
2004-10-01	14.5
2005-01-01	15.6
2005-04-01	14.8
2005-07-01	13.5
2005-10-01	13.1
2006-01-01	13.7
2006-04-01	11.6
2006-07-01	10.2
2006-10-01	9.2
2007-01-01	9.2
2007-04-01	7.9
2007-07-01	7.3
2007-10-01	6.6
2008-01-01	6.3
2008-04-01	5.7
2008-07-01	4.7
2008-10-01	4.9
2009-01-01	6.4
2009-04-01	6.2
2009-07-01	6.1
2009-10-01	6.6
2010-01-01	9.1
2010-04-01	7.9
2010-07-01	7.1
2010-10-01	7.5
2011-01-01	8.3
2011-04-01	7.4
2011-07-01	6.9
2011-10-01	7.4
2012-01-01	8.5
2012-04-01	7.7
2012-07-01	7.6
2012-10-01	7.9
2013-01-01	9.2
2013-04-01	8.3
2013-07-01	7.6
2013-10-01	7.7
2014-01-01	8.8
2014-04-01	7.5
2014-07-01	6.3
2014-10-01	6.3
2015-01-01	7.2
2015-04-01	6.3
2015-07-01	5.7
2015-10-01	5.6
2016-01-01	6.0
2016-04-01	5.4
2016-07-01	4.7
2016-10-01	4.6
2017-01-01	4.6
2017-04-01	4.3
2017-07-01	3.8
2017-10-01	3.6
2018-01-01	3.4
2018-04-01	3.2