Quarter	Percent
1999-04-01	33.7
2000-04-01	35.3
2001-04-01	34.2
2002-04-01	36.1
2003-01-01	28
2003-04-01	28
2003-07-01	28
2003-10-01	28
2004-01-01	26
2004-04-01	26
2004-07-01	26
2004-10-01	26
2005-01-01	28.4
2005-04-01	28.4
2005-07-01	28.4
2005-10-01	28.4
2006-01-01	25.4
2006-04-01	25.4
2006-07-01	25.4
2006-10-01	25.4
2007-01-01	28
2007-04-01	29.4
2007-07-01	24.8
2007-10-01	23.8
2008-01-01	26.2
2008-04-01	30.1
2008-07-01	23.4
2008-10-01	28.1
2009-01-01	19.4
2009-04-01	33.5
2009-07-01	32
2009-10-01	31.6
2010-01-01	21.3
2010-04-01	19.6
2010-07-01	24.3
2010-10-01	23.2
2011-01-01	26.8
2011-04-01	19.4
2011-07-01	24.1
2011-10-01	21.1
2012-01-01	19.1
2012-04-01	21.4
2012-07-01	25.7
2012-10-01	27.2
2013-01-01	16.8
2013-04-01	22.3
2013-07-01	27
2013-10-01	31
2014-01-01	23.1
2014-04-01	22.2
2014-07-01	17.4
2014-10-01	24.8
2015-01-01	27.5
2015-04-01	29.4
2015-07-01	35.2
2015-10-01	25.3
2016-01-01	24.2
2016-04-01	23.8
2016-07-01	21.8
2016-10-01	27.7
2017-01-01	24.0
2017-04-01	25.6
2017-07-01	32.0
2017-10-01	26.4
2018-01-01	28.7
2018-04-01	24.3