Quarter	Percent
2000-04-01	37
2001-04-01	37.3
2002-04-01	36.7
2003-04-01	36
2004-04-01	35.7
2005-01-01	35.2
2005-04-01	35.6
2005-07-01	37.1
2005-10-01	36
2006-01-01	35.4
2006-04-01	36.2
2006-07-01	38
2006-10-01	36.7
2007-01-01	36.3
2007-04-01	36.9
2007-07-01	38.7
2007-10-01	37.4
2008-01-01	37.0
2008-04-01	37.3
2008-07-01	38.6
2008-10-01	36.7
2009-01-01	35.1
2009-04-01	34.8
2009-07-01	35.7
2009-10-01	34.1
2010-01-01	33.2
2010-04-01	33.7
2010-07-01	35.1
2010-10-01	33.6
2011-01-01	32.6
2011-04-01	33.3
2011-07-01	34.4
2011-10-01	33.1
2012-01-01	31.8
2012-04-01	32.5
2012-07-01	33.7
2012-10-01	32.4
2013-01-01	31.4
2013-04-01	31.9
2013-07-01	33.3
2013-10-01	32.1
2014-01-01	31.2
2014-04-01	32.1
2014-07-01	33.7
2014-10-01	32.7
2015-01-01	32.3
2015-04-01	32.6
2015-07-01	34.2
2015-10-01	33.4
2016-01-01	32.8
2016-04-01	33.6
2016-07-01	34.9
2016-10-01	34.1
2017-01-01	33.5
2017-04-01	34.4
2017-07-01	35.8
2017-10-01	35.0
2018-01-01	34.4
2018-04-01	35.1