Quarter	Percent
1998-04-01	59.4
1999-04-01	57.7
2000-04-01	59.3
2001-01-01	53.5
2001-04-01	47.6
2001-07-01	45.5
2001-10-01	53.2
2002-01-01	54
2002-04-01	49.5
2002-07-01	46.5
2002-10-01	53.7
2003-01-01	55.3
2003-04-01	49.4
2003-07-01	48.4
2003-10-01	56
2004-01-01	56.6
2004-04-01	51.5
2004-07-01	48
2004-10-01	55.3
2005-01-01	56.7
2005-04-01	44.2
2005-07-01	46.2
2005-10-01	53.4
2006-01-01	54.2
2006-04-01	44.3
2006-07-01	44.1
2006-10-01	52.1
2007-01-01	51.7
2007-04-01	44.9
2007-07-01	43.6
2007-10-01	50.9
2008-01-01	50.9
2008-04-01	42.3
2008-07-01	43.5
2008-10-01	51.9
2009-01-01	52.3
2009-04-01	43.1
2009-07-01	46.9
2009-10-01	53.6
2010-01-01	52.9
2010-04-01	43.8
2010-07-01	44.8
2010-10-01	52.1
2011-01-01	50.8
2011-04-01	42.5
2011-07-01	43.8
2011-10-01	51
2012-01-01	51.4
2012-04-01	43.2
2012-07-01	44
2012-10-01	51.1
2013-01-01	49.6
2013-04-01	41.5
2013-07-01	42.2
2013-10-01	48.7
2014-01-01	48.2
2014-04-01	40.6
2014-07-01	40.6
2014-10-01	48.7
2015-01-01	47.6
2015-04-01	41.1
2015-07-01	41.7
2015-10-01	49.0
2016-01-01	47.3
2016-04-01	40.0
2016-07-01	43.8
2016-10-01	49.6
2017-01-01	48.1
2017-04-01	41.6
2017-07-01	42.3
2017-10-01	49.1
2018-01-01	49.0
2018-04-01	42.1