Quarter	Percent
2000-04-01	51.5
2001-04-01	51.5
2002-04-01	50.0
2003-04-01	48.5
2004-04-01	47.6
2005-01-01	46.7
2005-04-01	46.3
2005-07-01	46.2
2005-10-01	45.7
2006-01-01	46.1
2006-04-01	45.5
2006-07-01	45.3
2006-10-01	45
2007-01-01	45
2007-04-01	44.4
2007-07-01	44.1
2007-10-01	44.3
2008-01-01	44.4
2008-04-01	43.5
2008-07-01	43.5
2008-10-01	43.1
2009-01-01	43.2
2009-04-01	42.3
2009-07-01	42.8
2009-10-01	42.3
2010-01-01	42.2
2010-04-01	41.8
2010-07-01	42.0
2010-10-01	41.6
2011-01-01	41.8
2011-04-01	41.3
2011-07-01	41.4
2011-10-01	40.4
2012-01-01	40.4
2012-04-01	39.5
2012-07-01	39.0
2012-10-01	38.4
2013-01-01	38.6
2013-04-01	37.8
2013-07-01	37.3
2013-10-01	36.8
2014-01-01	36.8
2014-04-01	36.5
2014-07-01	36.2
2014-10-01	35.4
2015-01-01	35.6
2015-04-01	34.9
2015-07-01	34.5
2015-10-01	34.2
2016-01-01	33.7
2016-04-01	33.1
2016-07-01	32.9
2016-10-01	32.7
2017-01-01	33.0
2017-04-01	32.0
2017-07-01	31.7
2017-10-01	31.0
2018-01-01	31.4
2018-04-01	30.9