Quarter	Percent
1999-01-01	35.1
1999-04-01	35.1
1999-07-01	34.5
1999-10-01	34.6
2000-01-01	34.6
2000-04-01	34.4
2000-07-01	33.8
2000-10-01	33.8
2001-01-01	35.1
2001-04-01	34.7
2001-07-01	34.2
2001-10-01	34.3
2002-01-01	34.2
2002-04-01	34
2002-07-01	33.4
2002-10-01	33.6
2003-01-01	33.5
2003-04-01	33.2
2003-07-01	32.6
2003-10-01	32.8
2004-01-01	33
2004-04-01	32.8
2004-07-01	32.4
2004-10-01	32.5
2005-01-01	32.3
2005-04-01	31.9
2005-07-01	31.6
2005-10-01	31.8
2006-01-01	31.8
2006-04-01	31.6
2006-07-01	31.3
2006-10-01	31.7
2007-01-01	31.8
2007-04-01	31.4
2007-07-01	31.1
2007-10-01	31.6
2008-01-01	31.4
2008-04-01	31.2
2008-07-01	31
2008-10-01	31.6
2009-01-01	31.7
2009-04-01	31.9
2009-07-01	32.4
2009-10-01	32.7
2010-01-01	32.8
2010-04-01	32.4
2010-07-01	32.5
2010-10-01	33
2011-01-01	33.2
2011-04-01	33.2
2011-07-01	33
2011-10-01	33.3
2012-01-01	33.8
2012-04-01	33.4
2012-07-01	33.4
2012-10-01	34
2013-01-01	34.2
2013-04-01	34.4
2013-07-01	34.2
2013-10-01	34.7
2014-01-01	35.3
2014-04-01	34.9
2014-07-01	34.8
2014-10-01	34.9
2015-01-01	35.2
2015-04-01	35.0
2015-07-01	35.0
2015-10-01	35.5
2016-01-01	35.6
2016-04-01	35.6
2016-07-01	35.6
2016-10-01	36.0
2017-01-01	36.2
2017-04-01	36.1
2017-07-01	35.8
2017-10-01	36.3
2018-01-01	36.5
2018-04-01	36.2
2018-07-01	36.0