Quarterly Percent
1999-01-01 39.4
2000-01-01 39.3
2001-01-01 39.3
2002-01-01 39
2003-01-01 38.2
2003-04-01 38.4
2003-07-01 38.1
2003-10-01 38.2
2004-01-01 38.2
2004-04-01 38.3
2004-07-01 37.8
2004-10-01 38.0
2005-01-01 38.2
2005-04-01 38.0
2005-07-01 37.8
2005-10-01 38.0
2006-01-01 38.1
2006-04-01 38.2
2006-07-01 37.6
2006-10-01 37.9
2007-01-01 37.9
2007-04-01 37.8
2007-07-01 37.4
2007-10-01 37.6
2008-01-01 37.8
2008-04-01 37.6
2008-07-01 37.3
2008-10-01 37.3
2009-01-01 37.3
2009-04-01 37.0
2009-07-01 37.1
2009-10-01 37.1
2010-01-01 37.1
2010-04-01 37.1
2010-07-01 37.0
2010-10-01 37.2
2011-01-01 37.5
2011-04-01 37.4
2011-07-01 37.3
2011-10-01 37.2
2012-01-01 37.3
2012-04-01 37.1
2012-07-01 37.0
2012-10-01 36.8
2013-01-01 37.1
2013-04-01 37
2013-07-01 36.9
2013-10-01 37.1
2014-01-01 37.4
2014-04-01 37.5
2014-07-01 37.5
2014-10-01 37.3
2015-01-01 37.6
2015-04-01 37.5
2015-07-01 37.4
2015-10-01 37.5
2016-01-01 37.6
2016-04-01 37.7
2016-07-01 37.6
2016-10-01 37.7
2017-01-01 38.2
2017-04-01 37.8
2017-07-01 37.7
2017-10-01 37.8
2018-01-01 37.9
2018-04-01 37.9