Quarter	Percent
1999-01-01	14.5
1999-04-01	14.9
1999-07-01	11.8
1999-10-01	12.4
2000-01-01	12.4
2000-04-01	14.3
2000-07-01	13.6
2000-10-01	14.7
2001-01-01	15.3
2001-04-01	14.4
2001-07-01	16.6
2001-10-01	16.8
2002-01-01	15.3
2002-04-01	15.1
2002-07-01	14
2002-10-01	12.5
2003-01-01	14.8
2003-04-01	14.6
2003-07-01	13.4
2003-10-01	15.8
2004-01-01	16
2004-04-01	19.6
2004-07-01	19.5
2004-10-01	16.2
2005-01-01	15.6
2005-04-01	20.1
2005-07-01	18.9
2005-10-01	19.3
2006-01-01	19.6
2006-04-01	21.8
2006-07-01	22.2
2006-10-01	20.2
2007-01-01	20.7
2007-04-01	23.6
2007-07-01	23.8
2007-10-01	20.5
2008-01-01	19.7
2008-04-01	21.2
2008-07-01	21.8
2008-10-01	21.7
2009-01-01	21.9
2009-04-01	25.1
2009-07-01	26.8
2009-10-01	25.3
2010-01-01	23.1
2010-04-01	26
2010-07-01	23.9
2010-10-01	25.1
2011-01-01	20.5
2011-04-01	22.2
2011-07-01	24.5
2011-10-01	23.8
2012-01-01	23.7
2012-04-01	25.6
2012-07-01	25.1
2012-10-01	25.7
2013-01-01	23.8
2013-04-01	26.3
2013-07-01	25.6
2013-10-01	25.2
2014-01-01	26.8
2014-04-01	30.5
2014-07-01	30
2014-10-01	28.8
2015-01-01	29.1
2015-04-01	31.9
2015-07-01	31.5
2015-10-01	29.6
2016-01-01	34.0
2016-04-01	33.9
2016-07-01	31.2
2016-10-01	34.4
2017-01-01	35.6
2017-04-01	38.0
2017-07-01	36.8
2017-10-01	39.4
2018-01-01	40.0
2018-04-01	43.2