Quarter	Percent
1999-04-01	24.3
2000-01-01	23.9
2000-04-01	25.3
2000-07-01	29.9
2000-10-01	25.7
2001-01-01	19.9
2001-04-01	22.7
2001-07-01	28.6
2001-10-01	22.3
2002-01-01	16.5
2002-04-01	19.7
2002-07-01	23.8
2002-10-01	25.8
2003-01-01	21.5
2003-04-01	20.5
2003-07-01	26
2003-10-01	28.4
2004-01-01	18.4
2004-04-01	24.7
2004-07-01	25.6
2004-10-01	21.4
2005-01-01	25.9
2005-04-01	29.6
2005-07-01	25.8
2005-10-01	25.9
2006-01-01	23.8
2006-04-01	26.8
2006-07-01	25.2
2006-10-01	27.4
2007-01-01	27.4
2007-04-01	28.7
2007-07-01	32
2007-10-01	31.1
2008-01-01	31.8
2008-04-01	30.3
2008-07-01	33.4
2008-10-01	36.1
2009-01-01	30.9
2009-04-01	27.6
2009-07-01	26.2
2009-10-01	22
2010-01-01	22.4
2010-04-01	22.5
2010-07-01	24.9
2010-10-01	26.8
2011-01-01	27.1
2011-04-01	30.5
2011-07-01	31.5
2011-10-01	26.8
2012-01-01	31.8
2012-04-01	31.2
2012-07-01	30
2012-10-01	28.4
2013-01-01	29.2
2013-04-01	33.8
2013-07-01	29.9
2013-10-01	29.7
2014-01-01	30.2
2014-04-01	34.1
2014-07-01	35.3
2014-10-01	33.4
2015-01-01	33.0
2015-04-01	33.7
2015-07-01	32.7
2015-10-01	32.9
2016-01-01	30.6
2016-04-01	37.7
2016-07-01	40.4
2016-10-01	35.6
2017-01-01	35.6
2017-04-01	36.0
2017-07-01	41.3
2017-10-01	39.9
2018-01-01	38.3
2018-04-01	44.3