Quarter	Percent
1998-04-01	26.2
1998-10-01	27.9
1999-04-01	19.6
1999-10-01	25.1
2000-04-01	21.7
2000-10-01	25.8
2002-01-01	24.4
2002-04-01	25.4
2002-07-01	23.0
2002-10-01	22.3
2003-01-01	23.4
2003-04-01	26.6
2003-07-01	18.2
2003-10-01	22.3
2004-01-01	21.2
2004-04-01	30.8
2004-07-01	21.7
2004-10-01	27.0
2005-01-01	17.7
2005-04-01	23.3
2005-07-01	12.2
2005-10-01	19.7
2006-01-01	15.5
2006-04-01	20.3
2006-07-01	12.9
2006-10-01	16.3
2007-01-01	9.8
2007-04-01	12.3
2007-07-01	9.9
2007-10-01	7.7
2008-01-01	8.3
2008-04-01	13.4
2008-07-01	12.3
2008-10-01	19.8
2009-01-01	24.9
2009-04-01	24.9
2009-07-01	29.7
2009-10-01	36.6
2010-01-01	34.7
2010-04-01	32.9
2010-07-01	33.5
2010-10-01	38.2
2011-01-01	32.0
2011-04-01	36.4
2011-07-01	26.7
2011-10-01	27.3
2012-01-01	30.2
2012-04-01	32.7
2012-07-01	31.8
2012-10-01	23.4
2013-01-01	24.6
2013-04-01	21.0
2013-07-01	31.1
2013-10-01	22.1
2014-01-01	16.1
2014-04-01	20.5
2014-07-01	21.3
2014-10-01	21.8
2015-01-01	16.6
2015-04-01	10.6
2015-07-01	12.7
2015-10-01	16.3
2016-01-01	13.3
2016-04-01	11.1
2016-07-01	13.5
2016-10-01	10.7
2017-01-01	16.8
2017-04-01	15.3
2017-07-01	17.4
2017-10-01	11.7
2018-01-01	15.5