Quarter	Percent
1999-01-01	11.2
1999-04-01	10.6
1999-07-01	12.6
1999-10-01	10.9
2000-01-01	10.1
2000-04-01	10.4
2000-07-01	12.2
2000-10-01	11.1
2001-01-01	10
2001-04-01	9.5
2001-07-01	11.1
2001-10-01	9.5
2002-01-01	10
2002-04-01	10.2
2002-07-01	14.6
2002-10-01	12.8
2003-01-01	12.9
2003-04-01	12.1
2003-07-01	13.9
2003-10-01	12.5
2004-01-01	12.4
2004-04-01	14.2
2004-07-01	15.7
2004-10-01	15.6
2005-01-01	16.9
2005-04-01	17.9
2005-07-01	22
2005-10-01	19.3
2006-01-01	18.2
2006-04-01	18.6
2006-07-01	21.5
2006-10-01	20.8
2007-01-01	18.3
2007-04-01	17.1
2007-07-01	20.5
2007-10-01	19.4
2008-01-01	19.7
2008-04-01	20.6
2008-07-01	22
2008-10-01	19.2
2009-01-01	24.2
2009-04-01	23.3
2009-07-01	25
2009-10-01	25.5
2010-01-01	24
2010-04-01	23.8
2010-07-01	25.9
2010-10-01	24.9
2011-01-01	23.8
2011-04-01	23
2011-07-01	25
2011-10-01	26.8
2012-01-01	26.7
2012-04-01	25.8
2012-07-01	28.2
2012-10-01	27.7
2013-01-01	30.3
2013-04-01	27.3
2013-07-01	28
2013-10-01	26
2014-01-01	23.2
2014-04-01	21.8
2014-07-01	22.5
2014-10-01	16.5
2015-01-01	17.9
2015-04-01	16.2
2015-07-01	15.5
2015-10-01	14.3
2016-01-01	12.8
2016-04-01	13.7
2016-07-01	13.2
2016-10-01	12.0
2017-01-01	9.3
2017-04-01	11.2
2017-07-01	15.2
2017-10-01	12.5
2018-01-01	11.8
2018-04-01	11.0