Quarter	Percent
2005-01-01	20.5
2005-04-01	20.3
2005-07-01	21.2
2005-10-01	20.3
2006-01-01	22.5
2006-04-01	24.7
2006-07-01	23.3
2006-10-01	22.9
2007-01-01	22.8
2007-04-01	22.8
2007-07-01	23.3
2007-10-01	20.5
2008-01-01	23.7
2008-04-01	23.2
2008-07-01	27.9
2008-10-01	26.4
2009-01-01	24.4
2009-04-01	25.3
2009-07-01	27.1
2009-10-01	26.5
2010-01-01	25.3
2010-04-01	22.3
2010-07-01	26.5
2010-10-01	27.6
2011-01-01	23.9
2011-04-01	22.7
2011-07-01	25.9
2011-10-01	23.8
2012-01-01	24.8
2012-04-01	25.7
2012-07-01	27.3
2012-10-01	26.5
2013-01-01	25.9
2013-04-01	26.6
2013-07-01	29.4
2013-10-01	26.2
2014-01-01	29.1
2014-04-01	28.7
2014-07-01	30.3
2014-10-01	30.2
2015-01-01	28.5
2015-04-01	30.0
2015-07-01	31.2
2015-10-01	33.5
2016-01-01	32.0
2016-04-01	29.7
2016-07-01	33.7
2016-10-01	32.0
2017-01-01	29.9
2017-04-01	34.2
2017-07-01	33.0
2017-10-01	31.7
2018-01-01	32.4
2018-04-01	32.6