Quarterly Percent
1983-01-01 13.5
1983-04-01 13.6
1983-07-01 14
1983-10-01 14.4
1984-01-01 15.4
1984-04-01 15.3
1984-07-01 15.5
1984-10-01 15.8
1985-01-01 16.9
1985-04-01 16.7
1985-07-01 17
1985-10-01 16.7
1986-01-01 17.2
1986-04-01 16.7
1986-07-01 16.9
1986-10-01 16.6
1987-01-01 17
1987-04-01 16.6
1987-07-01 16.6
1987-10-01 16.3
1988-01-01 16.8
1988-04-01 16.2
1988-07-01 16.2
1988-10-01 15.6
1989-01-01 15.6
1989-04-01 14.9
1989-07-01 14.6
1989-10-01 13.8
1990-01-01 13.9
1990-04-01 13.1
1990-07-01 13.5
1990-10-01 13.3
1991-01-01 14.3
1991-04-01 14.6
1991-07-01 15.3
1991-10-01 14.9
1992-01-01 15.3
1992-04-01 15.1
1992-07-01 15.7
1992-10-01 15.5
1993-01-01 16
1993-04-01 15.7
1993-07-01 15.7
1993-10-01 15.2
1994-01-01 15.3
1994-04-01 14.6
1994-07-01 14.3
1994-10-01 13.3
1995-01-01 12.8
1995-04-01 12.1
1995-07-01 12.2
1995-10-01 12
1996-01-01 12.1
1996-04-01 11.7
1996-07-01 11.8
1996-10-01 11
1997-01-01 10.7
1997-04-01 10.1
1997-07-01 9.8
1997-10-01 8.9
1998-01-01 8.4
1998-04-01 7.7
1998-07-01 7.5
1998-10-01 6.7
1999-01-01 6.3
1999-04-01 5.8
1999-07-01 5.8
1999-10-01 5.2
2000-01-01 4.8
2000-04-01 4.3
2000-07-01 4.4
2000-10-01 3.9
2001-01-01 3.7
2001-04-01 3.7
2001-07-01 4.3
2001-10-01 4.0
2002-01-01 4.4
2002-04-01 4.2
2002-07-01 4.6
2002-10-01 4.6
2003-01-01 4.6
2003-04-01 4.5
2003-07-01 5.3
2003-10-01 4.6
2004-01-01 4.4
2004-04-01 4.5
2004-07-01 4.8
2004-10-01 4.4
2005-01-01 4.1
2005-04-01 4.3
2005-07-01 4.6
2005-10-01 4.4
2006-01-01 4.2
2006-04-01 4.4
2006-07-01 4.9
2006-10-01 4.2
2007-01-01 4.9
2007-04-01 5.2
2007-07-01 5.1
2007-10-01 4.9
2008-01-01 5.3
2008-04-01 6.1
2008-07-01 7.6
2008-10-01 8.1
2009-01-01 10.8
2009-04-01 12.9
2009-07-01 13.6
2009-10-01 13.3
2010-01-01 13.7
2010-04-01 14.6
2010-07-01 14.9
2010-10-01 15.1
2011-01-01 15.0
2011-04-01 15.3
2011-07-01 15.9
2011-10-01 15.3
2012-01-01 15.8
2012-04-01 15.9
2012-07-01 15.9
2012-10-01 14.5
2013-01-01 14.4
2013-04-01 14.7
2013-07-01 13.7
2013-10-01 12.4
2014-01-01 12.7
2014-04-01 12.5
2014-07-01 12.0
2014-10-01 10.5
2015-01-01 10.5
2015-04-01 10.4
2015-07-01 9.9
2015-10-01 9.1
2016-01-01 8.8
2016-04-01 9.1
2016-07-01 8.6
2016-10-01 7.2
2017-01-01 7.1
2017-04-01 6.9
2017-07-01 6.9
2017-10-01 6.1
2018-01-01 5.7
2018-04-01 6.0