Quarter	Percent
1999-04-01	28.2
2000-04-01	22.7
2001-04-01	20.1
2002-04-01	28.6
2003-01-01	33.5
2003-04-01	19.6
2003-07-01	18.6
2003-10-01	34.2
2004-01-01	36.5
2004-04-01	20.7
2004-07-01	21.7
2004-10-01	33.4
2005-01-01	31.9
2005-04-01	17.2
2005-07-01	19.8
2005-10-01	26.7
2006-01-01	29.1
2006-04-01	13.2
2006-07-01	17.2
2006-10-01	26.4
2007-01-01	25.3
2007-04-01	14.1
2007-07-01	16.8
2007-10-01	24.5
2008-01-01	26.8
2008-04-01	15.6
2008-07-01	17.6
2008-10-01	27.6
2009-01-01	34
2009-04-01	18.3
2009-07-01	22
2009-10-01	33.4
2010-01-01	33.6
2010-04-01	15.6
2010-07-01	24
2010-10-01	32.1
2011-01-01	33.2
2011-04-01	15
2011-07-01	25.3
2011-10-01	34.3
2012-01-01	31.5
2012-04-01	15.6
2012-07-01	21.1
2012-10-01	29.1
2013-01-01	30.6
2013-04-01	14.9
2013-07-01	17.3
2013-10-01	25.2
2014-01-01	25.8
2014-04-01	15.7
2014-07-01	18.7
2014-10-01	27.1
2015-01-01	25.0
2015-04-01	13.0
2015-07-01	16.9
2015-10-01	24.5
2016-01-01	22.8
2016-04-01	9.9
2016-07-01	13.6
2016-10-01	21.8
2017-01-01	20.3
2017-04-01	8.2
2017-07-01	18.0
2017-10-01	24.5
2018-01-01	25.0
2018-04-01	13.5