Quarter	Percent
1999-04-01	8.6
1999-07-01	9.6
1999-10-01	8.0
2000-01-01	7.0
2000-04-01	6.5
2000-07-01	7.5
2000-10-01	6.6
2001-01-01	5.9
2001-04-01	6.2
2001-07-01	8.6
2001-10-01	7.6
2002-01-01	7.8
2002-04-01	7.8
2002-07-01	9.4
2002-10-01	8.7
2003-01-01	8.5
2003-04-01	8.1
2003-07-01	10.9
2003-10-01	8.9
2004-01-01	7.9
2004-04-01	8.3
2004-07-01	10.5
2004-10-01	8.9
2005-01-01	7.5
2005-04-01	8.2
2005-07-01	9.7
2005-10-01	8.7
2006-01-01	7.9
2006-04-01	8.3
2006-07-01	10.7
2006-10-01	7.3
2007-01-01	8.3
2007-04-01	10.4
2007-07-01	9.3
2007-10-01	8.6
2008-01-01	9.7
2008-04-01	12.6
2008-07-01	15.4
2008-10-01	16.2
2009-01-01	19.5
2009-04-01	26.0
2009-07-01	26.4
2009-10-01	26.2
2010-01-01	26.2
2010-04-01	28.8
2010-07-01	28.4
2010-10-01	29.3
2011-01-01	27.9
2011-04-01	30.4
2011-07-01	30.4
2011-10-01	29.6
2012-01-01	30.1
2012-04-01	33.4
2012-07-01	31.5
2012-10-01	28.0
2013-01-01	26.9
2013-04-01	29.6
2013-07-01	26.4
2013-10-01	23.9
2014-01-01	24.9
2014-04-01	26.5
2014-07-01	22.7
2014-10-01	19.6
2015-01-01	21.2
2015-04-01	21.5
2015-07-01	20.0
2015-10-01	18.2
2016-01-01	16.6
2016-04-01	18.4
2016-07-01	17.2
2016-10-01	14.8
2017-01-01	13.0
2017-04-01	16.1
2017-07-01	16.1
2017-10-01	12.2
2018-01-01	12.5
2018-04-01	15.4