Quarterly Percent
1998-01-01 20.0
1998-04-01 20.2
1998-07-01 19.8
1998-10-01 19.7
1999-01-01 20.1
1999-04-01 20.3
1999-07-01 20
1999-10-01 20
2000-01-01 20.6
2000-04-01 21
2000-07-01 20.8
2000-10-01 21.1
2001-01-01 21.4
2001-04-01 21.6
2001-07-01 21.4
2001-10-01 21.3
2002-01-01 21.7
2002-04-01 21.6
2002-07-01 21.2
2002-10-01 21.2
2003-01-01 21.9
2003-04-01 22.2
2003-07-01 22
2003-10-01 22.1
2004-01-01 22.5
2004-04-01 22.4
2004-07-01 21.9
2004-10-01 21.8
2005-01-01 21.8
2005-04-01 21.8
2005-07-01 21.3
2005-10-01 21.7
2006-01-01 21.8
2006-04-01 21.9
2006-07-01 21.6
2006-10-01 21.7
2007-01-01 22.2
2007-04-01 22.1
2007-07-01 21.6
2007-10-01 21.6
2008-01-01 22.2
2008-04-01 22
2008-07-01 21.7
2008-10-01 21.5
2009-01-01 21.9
2009-04-01 21.7
2009-07-01 21.2
2009-10-01 21.2
2010-01-01 21.8
2010-04-01 21.6
2010-07-01 20.9
2010-10-01 21.3
2011-01-01 21.8
2011-04-01 21.2
2011-07-01 21
2011-10-01 21.3
2012-01-01 21.4
2012-04-01 20.8
2012-07-01 19.9
2012-10-01 20.1
2013-01-01 20.1
2013-04-01 19.6
2013-07-01 19.1
2013-10-01 19.3
2014-01-01 19.3
2014-04-01 19
2014-07-01 18.4
2014-10-01 18.4
2015-01-01 18.8
2015-04-01 18.8
2015-07-01 18.5
2015-10-01 18.4
2016-01-01 18.3
2016-04-01 18.1
2016-07-01 17.5
2016-10-01 17.4
2017-01-01 17.6
2017-04-01 17.4
2017-07-01 16.7
2017-10-01 16.8
2018-01-01 17.1
2018-04-01 16.8