Quarter	Percent
1983-01-01	28.4
1983-04-01	26.1
1983-07-01	30.8
1983-10-01	31.7
1984-01-01	29.8
1984-04-01	27.2
1984-07-01	31.6
1984-10-01	31.7
1985-01-01	29.1
1985-04-01	26
1985-07-01	29.1
1985-10-01	29
1986-01-01	26.5
1986-04-01	23.5
1986-07-01	27.3
1986-10-01	28.6
1987-01-01	27.1
1987-04-01	24.2
1987-07-01	27.2
1987-10-01	26.7
1988-01-01	23.9
1988-04-01	20.4
1988-07-01	24
1988-10-01	23.3
1989-01-01	20.8
1989-04-01	17.6
1989-07-01	21.6
1989-10-01	21.4
1990-01-01	19.3
1990-04-01	16.4
1990-07-01	20.5
1990-10-01	19.9
1991-01-01	17.5
1991-04-01	14.7
1991-07-01	18.4
1991-10-01	18.3
1992-01-01	16.5
1992-04-01	14.4
1992-07-01	18.7
1992-10-01	19.9
1993-01-01	19.9
1993-04-01	18.8
1993-07-01	24
1993-10-01	25.2
1994-01-01	24.4
1994-04-01	22.2
1994-07-01	26.5
1994-10-01	26.8
1995-01-01	25
1995-04-01	22.6
1995-07-01	27.1
1995-10-01	27.6
1996-01-01	25.9
1996-04-01	23.3
1996-07-01	28.1
1996-10-01	28.2
1997-01-01	26.3
1997-04-01	24
1997-07-01	27.9
1997-10-01	27.2
1998-01-01	24.4
1998-04-01	21.6
1998-07-01	26.2
1998-10-01	25.7
1999-01-01	23.0
1999-04-01	21.5
1999-07-01	25.2
1999-10-01	21.4
2000-01-01	15.6
2000-04-01	17.4
2000-07-01	24
2000-10-01	20.2
2001-01-01	14.1
2001-04-01	16.6
2001-07-01	19.1
2001-10-01	20.8
2002-01-01	19
2002-04-01	15.2
2002-07-01	19.9
2002-10-01	19
2003-01-01	19.9
2003-04-01	17.5
2003-07-01	26.6
2003-10-01	20.8
2004-01-01	18.9
2004-04-01	19.5
2004-07-01	27.1
2004-10-01	24.1
2005-01-01	21.3
2005-04-01	19.1
2005-07-01	26.2
2005-10-01	21.7
2006-01-01	19.4
2006-04-01	19.5
2006-07-01	28.7
2006-10-01	21.8
2007-01-01	20
2007-04-01	22.6
2007-07-01	22.4
2007-10-01	18.6
2008-01-01	16.2
2008-04-01	13.8
2008-07-01	24.1
2008-10-01	19.9
2009-01-01	22.3
2009-04-01	20.9
2009-07-01	23.5
2009-10-01	23.1
2010-01-01	25.7
2010-04-01	19.7
2010-07-01	23.1
2010-10-01	20.7
2011-01-01	18
2011-04-01	16.9
2011-07-01	24.4
2011-10-01	15.5
2012-01-01	18.4
2012-04-01	16.2
2012-07-01	20.6
2012-10-01	19.8
2013-01-01	21.6
2013-04-01	22.3
2013-07-01	23.7
2013-10-01	22.1
2014-01-01	26.6
2014-04-01	23.5
2014-07-01	19.6
2014-10-01	20
2015-01-01	20.1
2015-04-01	16.0
2015-07-01	21.2
2015-10-01	22.6
2016-01-01	18.8
2016-04-01	16.5
2016-07-01	21.2
2016-10-01	16.0
2017-01-01	18.7
2017-04-01	20.5
2017-07-01	16.9
2017-10-01	16.6
2018-01-01	15.1
2018-04-01	17.8
2018-07-01	20.6