Quarter	Percent
1982-12-31	20.6
1983-03-31	16.2
1983-06-30	16
1983-09-30	16.4
1983-12-31	15.6
1984-03-31	17.7
1984-06-30	18.5
1984-09-30	16.7
1984-12-31	17.3
1985-03-31	19.9
1985-06-30	19.1
1985-09-30	15
1985-12-31	15.1
1986-03-31	18.2
1986-06-30	19.1
1986-09-30	17.9
1986-12-31	21
1987-03-31	20.1
1987-06-30	17.8
1987-09-30	20.2
1987-12-31	20.3
1988-03-31	22
1988-06-30	25.3
1988-09-30	26.5
1988-12-31	23.7
1989-03-31	21.9
1989-06-30	21.2
1989-09-30	22.3
1989-12-31	21.4
1990-03-31	18.9
1990-06-30	16.6
1990-09-30	12.9
1990-12-31	11.4
1991-03-31	9.8
1991-06-30	6.7
1991-09-30	5.8
1991-12-31	6.2
1992-03-31	4.5
1992-06-30	4.7
1992-09-30	5.3
1992-12-31	3.9
1993-03-31	2.9
1993-06-30	2.7
1993-09-30	4.2
1993-12-31	5.1
1994-03-31	3.1
1994-06-30	2.3
1994-09-30	5.1
1994-12-31	8.1
1995-03-31	9.1
1995-06-30	7.4
1995-09-30	6.9
1995-12-31	9.5
1996-03-31	10.8
1996-06-30	9.1
1996-09-30	7.8
1996-12-31	7.8
1997-03-31	10.3
1997-06-30	11.4
1997-09-30	7.1
1997-12-31	6.4
1998-03-31	10
1998-06-30	9.2
1998-09-30	7.8
1998-12-31	6.2
1999-03-31	7
1999-06-30	9.3
1999-09-30	7
1999-12-31	8.9
2000-03-31	14.3
2000-06-30	13.6
2000-09-30	11.7
2000-12-31	11.2
2001-03-31	11.5
2001-06-30	11.1
2001-09-30	8
2001-12-31	6.5
2002-03-31	7.6
2002-06-30	9.7
2002-09-30	11.2
2002-12-31	11
2003-03-31	9.9
2003-06-30	11.4
2003-09-30	11.4
2003-12-31	11.9
2004-03-31	13.1
2004-06-30	12.6
2004-09-30	14.5
2004-12-31	12.9
2005-03-31	11
2005-06-30	12
2005-09-30	12.9
2005-12-31	12.1
2006-03-31	13.8
2006-06-30	19.1
2006-09-30	16.5
2006-12-31	10.8
2007-03-31	12.6
2007-06-30	15.9
2007-09-30	17.8
2007-12-31	14.1
2008-03-31	9.9
2008-06-30	15
2008-09-30	19
2008-12-31	19.8
2009-03-31	16.7
2009-06-30	3.5
2009-09-30	-1
2009-12-31	2.4
2010-03-31	1.2
2010-06-30	-0.6
2010-09-30	-3.1
2010-12-31	-4.7
2011-03-31	-2
2011-06-30	1.9
2011-09-30	0.3
2011-12-31	-5.3
2012-03-31	-8.6
2012-06-30	-7.5
2012-09-30	-3.7
2012-12-31	2.2
2013-03-31	0
2013-06-30	-4.4
2013-09-30	0.3
2013-12-31	-1.3
2014-03-31	-8.3
2014-06-30	-5.9
2014-09-30	-0.9
2014-12-31	-1.2
2015-03-31	-1.6
2015-06-30	-0.7
2015-09-30	1.4
2015-12-31	2.2
2016-03-31	3.3
2016-06-30	5
2016-09-30	3.4
2016-12-31	2.9
2017-03-31	6.5
2017-06-30	7.9
2017-09-30	5.5
2017-12-31	3.2
2018-03-31	0.7
2018-06-30	1.5
2018-09-30	2.4
2018-12-31	3.1
2019-03-31	4.1
2019-06-30	2.8
2019-09-30	6
2019-12-31	7.4
2020-03-31	8.1
2020-06-30	6.4
2020-09-30	0.6
2020-12-31	1.5
2021-03-31	0.3
2021-06-30	2
2021-09-30	2.7
2021-12-31	2.2
2022-03-31	5.4
2022-06-30	3
2022-09-30	3.7
2022-12-31	0.1
2023-03-31	-5.6
2023-06-30	-3.1
2023-09-30	-0.6
2023-12-31	1.6