Quarter	Percent
1983-01-01	17.7
1983-04-01	16.6
1983-07-01	16
1983-10-01	16.1
1984-01-01	15.4
1984-04-01	13.5
1984-07-01	12.9
1984-10-01	13
1985-01-01	12.8
1985-04-01	11.3
1985-07-01	10.2
1985-10-01	9.7
1986-01-01	8.9
1986-04-01	7.7
1986-07-01	7.5
1986-10-01	8.1
1987-01-01	8.6
1987-04-01	8.2
1987-07-01	7.5
1987-10-01	7.8
1988-01-01	8.0
1988-04-01	7.4
1988-07-01	7.9
1988-10-01	9.2
1989-01-01	10.4
1989-04-01	10
1989-07-01	9.7
1989-10-01	10.2
1990-01-01	10.3
1990-04-01	9.5
1990-07-01	9.9
1990-10-01	10.3
1991-01-01	10.5
1991-04-01	10
1991-07-01	10.8
1991-10-01	11.1
1992-01-01	11.4
1992-04-01	10.7
1992-07-01	11.7
1992-10-01	12.4
1993-01-01	13.3
1993-04-01	12.4
1993-07-01	12.5
1993-10-01	11.5
1994-01-01	10.9
1994-04-01	9.0
1994-07-01	9.8
1994-10-01	10.5
1995-01-01	11.5
1995-04-01	10.8
1995-07-01	11.2
1995-10-01	11.4
1996-01-01	12.4
1996-04-01	10.9
1996-07-01	10.8
1996-10-01	9.9
1997-01-01	10.1
1997-04-01	8.6
1997-07-01	8.6
1997-10-01	7.8
1998-01-01	7.9
1998-04-01	6.6
1998-07-01	7.5
1998-10-01	7.8
1999-01-01	9.7
1999-04-01	9.1
1999-07-01	9.0
1999-10-01	7.6
2000-01-01	5.8
2000-04-01	6.0
2000-07-01	7.3
2000-10-01	3.8
2001-01-01	6.8
2001-04-01	9.3
2001-07-01	10.2
2001-10-01	7.5
2002-01-01	7.6
2002-04-01	5.2
2002-07-01	9.6
2002-10-01	7.4
2003-01-01	11.5
2003-04-01	9.0
2003-07-01	9.8
2003-10-01	6.7
2004-01-01	8.5
2004-04-01	7.1
2004-07-01	7.5
2004-10-01	6.5
2005-01-01	7.6
2005-04-01	9.8
2005-07-01	9.9
2005-10-01	7.0
2006-01-01	9.4
2006-04-01	7.6
2006-07-01	7.7
2006-10-01	5.2
2007-01-01	7.6
2007-04-01	6.5
2007-07-01	9.5
2007-10-01	5.9
2008-01-01	8.8
2008-04-01	8.5
2008-07-01	10
2008-10-01	7.4
2009-01-01	8.6
2009-04-01	10.2
2009-07-01	11.3
2009-10-01	11
2010-01-01	11.4
2010-04-01	10.4
2010-07-01	13.5
2010-10-01	11.7
2011-01-01	11.7
2011-04-01	11.4
2011-07-01	14.2
2011-10-01	13.5
2012-01-01	14
2012-04-01	13.9
2012-07-01	12.5
2012-10-01	13.4
2013-01-01	12.1
2013-04-01	10.7
2013-07-01	12.5
2013-10-01	12
2014-01-01	12.3
2014-04-01	11.5
2014-07-01	11.9
2014-10-01	10.2
2015-01-01	9.9
2015-04-01	9.1
2015-07-01	11.9
2015-10-01	9.3
2016-01-01	9.6
2016-04-01	9.1
2016-07-01	13.1
2016-10-01	11.8
2017-01-01	12.0
2017-04-01	10.0
2017-07-01	11.8
2017-10-01	8.8