Quarter	Percent
1999-04-01	25.1
2000-04-01	19.5
2001-04-01	20.5
2002-04-01	29.6
2003-01-01	32.9
2003-04-01	23.7
2003-07-01	19.7
2003-10-01	37.9
2004-01-01	36.2
2004-04-01	24.3
2004-07-01	20.6
2004-10-01	30.8
2005-01-01	26.6
2005-04-01	16.7
2005-07-01	20.7
2005-10-01	23.8
2006-01-01	23.5
2006-04-01	12
2006-07-01	16.5
2006-10-01	26.9
2007-01-01	24.1
2007-04-01	15
2007-07-01	17.8
2007-10-01	25.3
2008-01-01	24.4
2008-04-01	16.8
2008-07-01	18
2008-10-01	23.1
2009-01-01	31.9
2009-04-01	18.6
2009-07-01	20.5
2009-10-01	27
2010-01-01	33.2
2010-04-01	12.6
2010-07-01	21.6
2010-10-01	28.2
2011-01-01	30.4
2011-04-01	11.5
2011-07-01	25.8
2011-10-01	34.2
2012-01-01	27.8
2012-04-01	15.9
2012-07-01	19.5
2012-10-01	24.8
2013-01-01	26.5
2013-04-01	12.3
2013-07-01	15.7
2013-10-01	19.6
2014-01-01	23.1
2014-04-01	16.0
2014-07-01	18.0
2014-10-01	27.8
2015-01-01	22.4
2015-04-01	12.1
2015-07-01	17.2
2015-10-01	20.5
2016-01-01	22.4
2016-04-01	7.7
2016-07-01	15.2
2016-10-01	20.9
2017-01-01	17.6
2017-04-01	8.9
2017-07-01	19.8
2017-10-01	24.4
2018-01-01	23.8
2018-04-01	12.7