Quarter	Percent
1998-04-01	32.1
1999-01-01	33.7
1999-04-01	35.1
1999-07-01	33.2
1999-10-01	33.1
2000-01-01	36.6
2000-04-01	35.1
2000-07-01	37.6
2000-10-01	36.3
2001-01-01	34.3
2001-04-01	35.1
2001-07-01	35.5
2001-10-01	35.6
2002-01-01	36.1
2002-04-01	35.1
2002-07-01	37
2002-10-01	35.7
2003-01-01	34.2
2003-04-01	38.7
2003-07-01	38.4
2003-10-01	40
2004-01-01	38.3
2004-04-01	39.3
2004-07-01	39.9
2004-10-01	38.7
2005-01-01	40.8
2005-04-01	41.3
2005-07-01	43.8
2005-10-01	41
2006-01-01	40.6
2006-04-01	38.3
2006-07-01	40.6
2006-10-01	44.1
2007-01-01	44.6
2007-04-01	41
2007-07-01	42.8
2007-10-01	43
2008-01-01	42.9
2008-04-01	41.3
2008-07-01	43.3
2008-10-01	44
2009-01-01	42.2
2009-04-01	41.7
2009-07-01	43.5
2009-10-01	44.2
2010-01-01	44.2
2010-04-01	46.1
2010-07-01	45.1
2010-10-01	46.9
2011-01-01	43.9
2011-04-01	47
2011-07-01	45.9
2011-10-01	47.1
2012-01-01	45.8
2012-04-01	46.6
2012-07-01	46.1
2012-10-01	45.5
2013-01-01	46.5
2013-04-01	48.9
2013-07-01	48.1
2013-10-01	47.4
2014-01-01	47.2
2014-04-01	50
2014-07-01	47.1
2014-10-01	49.5
2015-01-01	47.9
2015-04-01	48.1
2015-07-01	50.4
2015-10-01	49.0
2016-01-01	49.0
2016-04-01	51.8
2016-07-01	51.3
2016-10-01	50.9
2017-01-01	52.7
2017-04-01	53.0
2017-07-01	53.1
2017-10-01	56.5
2018-01-01	55.9
2018-04-01	54.8