Quarter	Percent
1999-04-01	36
2000-04-01	37.4
2001-04-01	36.8
2002-04-01	38.2
2003-01-01	31
2003-04-01	31
2003-07-01	31
2003-10-01	31
2004-01-01	29.6
2004-04-01	29.6
2004-07-01	29.6
2004-10-01	29.6
2005-01-01	32.1
2005-04-01	32.1
2005-07-01	32.1
2005-10-01	32.1
2006-01-01	30.6
2006-04-01	30.6
2006-07-01	30.6
2006-10-01	30.6
2007-01-01	32.3
2007-04-01	35.5
2007-07-01	29
2007-10-01	25.7
2008-01-01	30.3
2008-04-01	35.1
2008-07-01	27.9
2008-10-01	29.9
2009-01-01	28.8
2009-04-01	37.1
2009-07-01	35.7
2009-10-01	38.1
2010-01-01	26.3
2010-04-01	24
2010-07-01	29.5
2010-10-01	27.5
2011-01-01	28.3
2011-04-01	23
2011-07-01	28
2011-10-01	26.1
2012-01-01	27.5
2012-04-01	24.8
2012-07-01	30.2
2012-10-01	32.6
2013-01-01	23.7
2013-04-01	28.4
2013-07-01	31.5
2013-10-01	35.8
2014-01-01	30.2
2014-04-01	26.4
2014-07-01	29.7
2014-10-01	32.3
2015-01-01	34.4
2015-04-01	34.1
2015-07-01	42.2
2015-10-01	34.1
2016-01-01	27.6
2016-04-01	29.0
2016-07-01	31.2
2016-10-01	33.7
2017-01-01	31.3
2017-04-01	31.7
2017-07-01	35.5
2017-10-01	31.8
2018-01-01	34.0
2018-04-01	29.6