Quarterly Percent
1998-01-01 37.5
1998-04-01 37.7
1998-07-01 38.0
1998-10-01 37.5
1999-01-01 37.2
1999-04-01 37.0
1999-07-01 37.0
1999-10-01 36.9
2000-01-01 36.2
2000-04-01 36.3
2000-07-01 35.8
2000-10-01 36
2001-01-01 35.2
2001-04-01 35.4
2001-07-01 35.4
2001-10-01 35
2002-01-01 35
2002-04-01 34.6
2002-07-01 34.2
2002-10-01 34
2003-01-01 33.4
2003-04-01 33.5
2003-07-01 33.8
2003-10-01 33.7
2004-01-01 33.8
2004-04-01 33.5
2004-07-01 33
2004-10-01 32.6
2005-01-01 32.6
2005-04-01 32.4
2005-07-01 32
2005-10-01 31.9
2006-01-01 32
2006-04-01 31.8
2006-07-01 31.5
2006-10-01 31.6
2007-01-01 31.5
2007-04-01 31.5
2007-07-01 31
2007-10-01 31
2008-01-01 31.4
2008-04-01 30.8
2008-07-01 30.9
2008-10-01 31.4
2009-01-01 31
2009-04-01 31.3
2009-07-01 31.3
2009-10-01 31
2010-01-01 30.3
2010-04-01 30.2
2010-07-01 30.2
2010-10-01 30.5
2011-01-01 30.4
2011-04-01 30
2011-07-01 30.7
2011-10-01 30.9
2012-01-01 30.4
2012-04-01 30.2
2012-07-01 30
2012-10-01 30.5
2013-01-01 30.7
2013-04-01 30.4
2013-07-01 30.2
2013-10-01 29.6
2014-01-01 30.2
2014-04-01 30
2014-07-01 29.7
2014-10-01 30.1
2015-01-01 29.6
2015-04-01 29.6
2015-07-01 29.6
2015-10-01 29.8
2016-01-01 29.6
2016-04-01 29.9
2016-07-01 29.3
2016-10-01 29.2
2017-01-01 28.9
2017-04-01 28.6
2017-07-01 27.9
2017-10-01 28.0
2018-01-01 27.9
2018-04-01 27.6