Quarter	Percent
1999-01-01	10.5
1999-04-01	10.6
1999-07-01	10.1
1999-10-01	10.1
2000-01-01	10.5
2000-04-01	10.2
2000-07-01	9.3
2000-10-01	9.3
2001-01-01	9.9
2001-04-01	10
2001-07-01	10
2001-10-01	9.2
2002-01-01	9.5
2002-04-01	9.1
2002-07-01	9.5
2002-10-01	10
2003-01-01	10.3
2003-04-01	11.1
2003-07-01	11.5
2003-10-01	12.1
2004-01-01	11.4
2004-04-01	12.2
2004-07-01	13.1
2004-10-01	13.7
2005-01-01	14
2005-04-01	15.3
2005-07-01	15.9
2005-10-01	17.1
2006-01-01	17.5
2006-04-01	19
2006-07-01	19.4
2006-10-01	19.8
2007-01-01	19.9
2007-04-01	21.1
2007-07-01	21.2
2007-10-01	22.5
2008-01-01	22.7
2008-04-01	23.4
2008-07-01	25.5
2008-10-01	25.1
2009-01-01	24.9
2009-04-01	26.4
2009-07-01	27.1
2009-10-01	26
2010-01-01	27.9
2010-04-01	28.7
2010-07-01	29.2
2010-10-01	29
2011-01-01	29.6
2011-04-01	31.2
2011-07-01	32.3
2011-10-01	32.6
2012-01-01	33.1
2012-04-01	33.7
2012-07-01	33.7
2012-10-01	34
2013-01-01	35.7
2013-04-01	35.3
2013-07-01	35.6
2013-10-01	36.3
2014-01-01	35.3
2014-04-01	36.3
2014-07-01	38.3
2014-10-01	39
2015-01-01	39.2
2015-04-01	40.8
2015-07-01	41.9
2015-10-01	42.0
2016-01-01	41.2
2016-04-01	42.7
2016-07-01	44.5
2016-10-01	45.6
2017-01-01	48.1
2017-04-01	49.6
2017-07-01	49.8
2017-10-01	50.9
2018-01-01	49.9
2018-04-01	49.6