Quarter	Percent
1999-04-01	6.8
2000-04-01	6.4
2001-04-01	6.3
2002-04-01	7.0
2003-01-01	10.9
2003-04-01	10.9
2003-07-01	10.9
2003-10-01	10.9
2004-01-01	16.9
2004-04-01	16.9
2004-07-01	16.9
2004-10-01	16.9
2005-01-01	13.7
2005-04-01	13.7
2005-07-01	13.7
2005-10-01	13.7
2006-01-01	16.2
2006-04-01	16.2
2006-07-01	16.2
2006-10-01	16.2
2007-01-01	15
2007-04-01	14.9
2007-07-01	18.3
2007-10-01	12.3
2008-01-01	17.3
2008-04-01	13.5
2008-07-01	23
2008-10-01	18
2009-01-01	24.8
2009-04-01	13
2009-07-01	14.3
2009-10-01	18.1
2010-01-01	15.5
2010-04-01	16.6
2010-07-01	12.5
2010-10-01	12.7
2011-01-01	14.8
2011-04-01	18.7
2011-07-01	15.8
2011-10-01	18.4
2012-01-01	22.7
2012-04-01	13.5
2012-07-01	18.4
2012-10-01	19.7
2013-01-01	19.6
2013-04-01	18
2013-07-01	14.7
2013-10-01	10.9
2014-01-01	18.5
2014-04-01	16.9
2014-07-01	36.6
2014-10-01	18.6
2015-01-01	18.9
2015-04-01	12.3
2015-07-01	17.4
2015-10-01	20.7
2016-01-01	17.0
2016-04-01	18.0
2016-07-01	23.1
2016-10-01	16.6
2017-01-01	15.8
2017-04-01	15.7
2017-07-01	13.7
2017-10-01	16.5
2018-01-01	13.4
2018-04-01	13.0