Quarter	Percent
1998-04-01	14.2
1999-01-01	17.9
1999-04-01	16.1
1999-07-01	16.9
1999-10-01	16.3
2000-01-01	16.1
2000-04-01	15.8
2000-07-01	18.4
2000-10-01	18.2
2001-01-01	16.2
2001-04-01	15.8
2001-07-01	15.8
2001-10-01	15.7
2002-01-01	18.1
2002-04-01	17.4
2002-07-01	18.3
2002-10-01	19.1
2003-01-01	19.5
2003-04-01	18
2003-07-01	19.5
2003-10-01	19.9
2004-01-01	21.5
2004-04-01	21.8
2004-07-01	22.7
2004-10-01	22.5
2005-01-01	21.8
2005-04-01	24
2005-07-01	23.3
2005-10-01	24.4
2006-01-01	23.4
2006-04-01	24.3
2006-07-01	25.5
2006-10-01	25.3
2007-01-01	26.2
2007-04-01	28.3
2007-07-01	26.9
2007-10-01	28.4
2008-01-01	27.9
2008-04-01	25.5
2008-07-01	30.4
2008-10-01	27.6
2009-01-01	27.3
2009-04-01	30
2009-07-01	30.1
2009-10-01	29.7
2010-01-01	31.4
2010-04-01	29.7
2010-07-01	31.8
2010-10-01	30.6
2011-01-01	31.5
2011-04-01	35
2011-07-01	33.3
2011-10-01	32.1
2012-01-01	33
2012-04-01	36.2
2012-07-01	36.2
2012-10-01	34.3
2013-01-01	36.7
2013-04-01	36.4
2013-07-01	40
2013-10-01	38.3
2014-01-01	36.4
2014-04-01	39.8
2014-07-01	39.7
2014-10-01	40
2015-01-01	40.0
2015-04-01	41.4
2015-07-01	41.2
2015-10-01	42.2
2016-01-01	41.5
2016-04-01	42.6
2016-07-01	42.5
2016-10-01	44.4
2017-01-01	44.2
2017-04-01	46.1
2017-07-01	47.2
2017-10-01	45.5
2018-01-01	45.6
2018-04-01	46.7