Quarter	Percent
2004-01-01	27.4
2004-04-01	28.9
2004-07-01	24.4
2004-10-01	28.3
2005-01-01	28.6
2005-04-01	25.6
2005-07-01	28.4
2005-10-01	27.7
2006-01-01	28.3
2006-04-01	24.9
2006-07-01	21.8
2006-10-01	26.4
2007-01-01	23.5
2007-04-01	20.8
2007-07-01	22.3
2007-10-01	26.6
2008-01-01	24.8
2008-04-01	25
2008-07-01	21.9
2008-10-01	27
2009-01-01	30.2
2009-04-01	27.5
2009-07-01	25.7
2009-10-01	30.5
2010-01-01	29.7
2010-04-01	28.7
2010-07-01	26.2
2010-10-01	32.7
2011-01-01	32.9
2011-04-01	32.5
2011-07-01	28.2
2011-10-01	34.5
2012-01-01	39.2
2012-04-01	35.6
2012-07-01	33.9
2012-10-01	41.4
2013-01-01	42.6
2013-04-01	37.1
2013-07-01	37.8
2013-10-01	47.9
2014-01-01	48.5
2014-04-01	41.5
2014-07-01	41.1
2014-10-01	47.5
2015-01-01	48.9
2015-04-01	43.0
2015-07-01	37.2
2015-10-01	40.9
2016-01-01	41.0
2016-04-01	36.1
2016-07-01	37.6
2016-10-01	43.8
2017-01-01	39.4
2017-04-01	35.7
2017-07-01	35.2
2017-10-01	39.0
2018-01-01	37.2
2018-04-01	34.1