Quarter	Percent
1999-01-01	15.2
1999-04-01	15.1
1999-07-01	11.9
1999-10-01	12.5
2000-01-01	12.6
2000-04-01	14.8
2000-07-01	14.3
2000-10-01	14.8
2001-01-01	15.8
2001-04-01	15
2001-07-01	17.1
2001-10-01	17.1
2002-01-01	15.8
2002-04-01	15.4
2002-07-01	14.1
2002-10-01	12.6
2003-01-01	15
2003-04-01	15
2003-07-01	13.5
2003-10-01	16.3
2004-01-01	16.3
2004-04-01	20
2004-07-01	19.8
2004-10-01	16.3
2005-01-01	16
2005-04-01	20.2
2005-07-01	19.6
2005-10-01	20
2006-01-01	20.1
2006-04-01	22.5
2006-07-01	22.5
2006-10-01	20.6
2007-01-01	21.4
2007-04-01	24.3
2007-07-01	24.5
2007-10-01	21.9
2008-01-01	20.5
2008-04-01	22.3
2008-07-01	22.8
2008-10-01	23
2009-01-01	22.8
2009-04-01	25.6
2009-07-01	27.7
2009-10-01	26.2
2010-01-01	24.1
2010-04-01	26.9
2010-07-01	25.1
2010-10-01	25.8
2011-01-01	21.2
2011-04-01	23.6
2011-07-01	25.4
2011-10-01	24.7
2012-01-01	25
2012-04-01	27.3
2012-07-01	26.3
2012-10-01	27.3
2013-01-01	25.7
2013-04-01	28.4
2013-07-01	27.2
2013-10-01	26.6
2014-01-01	29
2014-04-01	32.4
2014-07-01	32.2
2014-10-01	30.8
2015-01-01	31.0
2015-04-01	33.6
2015-07-01	34.3
2015-10-01	32.8
2016-01-01	35.7
2016-04-01	36.0
2016-07-01	33.0
2016-10-01	36.1
2017-01-01	37.7
2017-04-01	40.3
2017-07-01	39.2
2017-10-01	40.9
2018-01-01	41.7
2018-04-01	45.5