Quarter	Percent
1998-04-01	29.4
1999-01-01	31.2
1999-04-01	30.1
1999-07-01	36.6
1999-10-01	33.5
2000-01-01	28.3
2000-04-01	32.6
2000-07-01	34.2
2000-10-01	32.2
2001-01-01	30
2001-04-01	30
2001-07-01	35.4
2001-10-01	31.6
2002-01-01	30.6
2002-04-01	30.2
2002-07-01	35.2
2002-10-01	33.7
2003-01-01	31.6
2003-04-01	28.8
2003-07-01	32.6
2003-10-01	32.6
2004-01-01	32.8
2004-04-01	32.2
2004-07-01	34.5
2004-10-01	31.6
2005-01-01	32.5
2005-04-01	31.5
2005-07-01	31.3
2005-10-01	33.9
2006-01-01	31.7
2006-04-01	28.6
2006-07-01	34.2
2006-10-01	33.1
2007-01-01	30.8
2007-04-01	31
2007-07-01	32.2
2007-10-01	32.2
2008-01-01	30
2008-04-01	28.3
2008-07-01	33.2
2008-10-01	31.5
2009-01-01	27.9
2009-04-01	29.1
2009-07-01	32.1
2009-10-01	30.6
2010-01-01	30.1
2010-04-01	27
2010-07-01	31.7
2010-10-01	30.3
2011-01-01	29.7
2011-04-01	28
2011-07-01	31.1
2011-10-01	30.3
2012-01-01	27.2
2012-04-01	24.6
2012-07-01	29.7
2012-10-01	30.1
2013-01-01	27
2013-04-01	27.1
2013-07-01	30.4
2013-10-01	28.5
2014-01-01	26.9
2014-04-01	27
2014-07-01	29.9
2014-10-01	28.5
2015-01-01	27.3
2015-04-01	25.7
2015-07-01	27.8
2015-10-01	27.7
2016-01-01	26.9
2016-04-01	24.8
2016-07-01	27.0
2016-10-01	25.9
2017-01-01	23.8
2017-04-01	22.5
2017-07-01	28.0
2017-10-01	27.5
2018-01-01	27.1
2018-04-01	24.7