Quarterly Percent
1998-01-01 18
1998-04-01 17
1998-07-01 17.2
1998-10-01 17.8
1999-01-01 18.4
1999-04-01 18.5
1999-07-01 18.1
1999-10-01 19.2
2000-01-01 18.9
2000-04-01 17.3
2000-07-01 16.9
2000-10-01 16.8
2001-01-01 17.2
2001-04-01 16.1
2001-07-01 15.6
2001-10-01 17
2002-01-01 17.3
2002-04-01 15.5
2002-07-01 15.3
2002-10-01 15.6
2003-01-01 16
2003-04-01 14.6
2003-07-01 14.8
2003-10-01 15.8
2004-01-01 17.3
2004-04-01 16.1
2004-07-01 16
2004-10-01 16.3
2005-01-01 16.3
2005-04-01 15.4
2005-07-01 15.3
2005-10-01 15.2
2006-01-01 14.9
2006-04-01 13.6
2006-07-01 13.2
2006-10-01 13.8
2007-01-01 14.3
2007-04-01 12.9
2007-07-01 12.5
2007-10-01 12.5
2008-01-01 12.5
2008-04-01 11.2
2008-07-01 11
2008-10-01 11.9
2009-01-01 13.3
2009-04-01 12.8
2009-07-01 13.3
2009-10-01 14.3
2010-01-01 15.8
2010-04-01 15.6
2010-07-01 16.4
2010-10-01 18.3
2011-01-01 19.8
2011-04-01 20.3
2011-07-01 21.8
2011-10-01 24.9
2012-01-01 26.8
2012-04-01 27.6
2012-07-01 29.1
2012-10-01 30
2013-01-01 31.4
2013-04-01 31.4
2013-07-01 31.5
2013-10-01 32
2014-01-01 31.6
2014-04-01 30.6
2014-07-01 29.4
2014-10-01 29.8
2015-01-01 30.9
2015-04-01 28.6
2015-07-01 28.4
2015-10-01 28.7
2016-01-01 29.7
2016-04-01 27.9
2016-07-01 27.4
2016-10-01 28.3
2017-01-01 28.0
2017-04-01 25.7
2017-07-01 25.1
2017-10-01 26.3
2018-01-01 26.4
2018-04-01 23.9