Quarter	Percent
1998-04-01	17.5
1999-04-01	16.3
2000-04-01	9.5
2001-01-01	13
2001-04-01	11.7
2001-07-01	10.3
2001-10-01	12
2002-01-01	14.7
2002-04-01	12.9
2002-07-01	11.1
2002-10-01	12.8
2003-01-01	14.4
2003-04-01	14.3
2003-07-01	11.8
2003-10-01	14.4
2004-01-01	18.3
2004-04-01	18.5
2004-07-01	14.8
2004-10-01	16.7
2005-01-01	19.4
2005-04-01	28
2005-07-01	19
2005-10-01	20.3
2006-01-01	24.4
2006-04-01	26.8
2006-07-01	16.9
2006-10-01	18
2007-01-01	21.3
2007-04-01	23.5
2007-07-01	15.1
2007-10-01	17.4
2008-01-01	20.5
2008-04-01	25.1
2008-07-01	16.2
2008-10-01	18.8
2009-01-01	24.3
2009-04-01	29.1
2009-07-01	22.2
2009-10-01	24
2010-01-01	28.4
2010-04-01	29.3
2010-07-01	20.3
2010-10-01	21.1
2011-01-01	24.9
2011-04-01	27.1
2011-07-01	18.4
2011-10-01	20.6
2012-01-01	24.8
2012-04-01	27.4
2012-07-01	20.1
2012-10-01	22.1
2013-01-01	26.6
2013-04-01	27.9
2013-07-01	19.1
2013-10-01	20.5
2014-01-01	25.6
2014-04-01	27.6
2014-07-01	18.1
2014-10-01	20.2
2015-01-01	23.7
2015-04-01	25.2
2015-07-01	15.9
2015-10-01	16.5
2016-01-01	21.9
2016-04-01	22.9
2016-07-01	14.7
2016-10-01	15.8
2017-01-01	20.3
2017-04-01	21.9
2017-07-01	14.8
2017-10-01	14.5
2018-01-01	18.0
2018-04-01	20.6