Quarter	Percent
1987-12-31	20.2
1988-03-31	17
1988-06-30	16.5
1988-09-30	16.8
1988-12-31	16.1
1989-03-31	21.8
1989-06-30	18.8
1989-09-30	14.5
1989-12-31	23
1990-03-31	13.9
1990-06-30	14.8
1990-09-30	15.4
1990-12-31	8.2
1991-03-31	7.3
1991-06-30	1.2
1991-09-30	-5
1991-12-31	-5.6
1992-03-31	-9.3
1992-06-30	-10.1
1992-09-30	-5.4
1992-12-31	-10.9
1993-03-31	-11.6
1993-06-30	-13.7
1993-09-30	-18
1993-12-31	-13.3
1994-03-31	-6.9
1994-06-30	-0.5
1994-09-30	-2.4
1994-12-31	-4.6
1995-03-31	1.2
1995-06-30	-2.2
1995-09-30	3.7
1995-12-31	0.3
1996-03-31	-4.1
1996-06-30	-2.7
1996-09-30	-3.9
1996-12-31	-6
1997-03-31	-4.6
1997-06-30	-3.2
1997-09-30	-4.6
1997-12-31	0.6
1998-03-31	7.2
1998-06-30	-1.3
1998-09-30	5
1998-12-31	1.9
1999-03-31	-7
1999-06-30	-9.6
1999-09-30	-10.3
1999-12-31	-7.5
2000-03-31	-11.7
2000-06-30	-7.2
2000-09-30	-0.5
2000-12-31	-6.3
2001-03-31	-5.5
2001-06-30	-1.5
2001-09-30	-12.7
2001-12-31	-10.7
2002-03-31	-5.9
2002-06-30	-6.3
2002-09-30	-5
2002-12-31	8
2003-03-31	-0.2
2003-06-30	-8.9
2003-09-30	-17.2
2003-12-31	-21.4
2004-03-31	-15.2
2004-06-30	-2.7
2004-09-30	3.2
2004-12-31	5.8
2005-03-31	2.3
2005-06-30	2.2
2005-09-30	-6.2
2005-12-31	-10.4
2006-03-31	-13.1
2006-06-30	-16.9
2006-09-30	-10.4
2006-12-31	-7.7
2007-03-31	2.4
2007-06-30	-4.4
2007-09-30	-9.4
2007-12-31	-7.3
2008-03-31	-11.3
2008-06-30	-4.8
2008-09-30	1
2008-12-31	1.7
2009-03-31	0.9
2009-06-30	-1.5
2009-09-30	-7.7
2009-12-31	0.5
2010-03-31	-2.4
2010-06-30	-12.9
2010-09-30	-11.8
2010-12-31	-19.8
2011-03-31	-19.9
2011-06-30	-16
2011-09-30	-15.2
2011-12-31	-18.1
2012-03-31	-19.9
2012-06-30	-8.3
2012-09-30	-7.9
2012-12-31	-12.9
2013-03-31	-6.6
2013-06-30	-10.2
2013-09-30	-12.6
2013-12-31	-3.8
2014-03-31	-4
2014-06-30	-5.5
2014-09-30	1.3
2014-12-31	9.1
2015-03-31	14
2015-06-30	27.6
2015-09-30	33.1
2015-12-31	20.7
2016-03-31	11.7
2016-06-30	3.1
2016-09-30	4.2
2016-12-31	8.9
2017-03-31	3.9
2017-06-30	-0.3
2017-09-30	-0.7
2017-12-31	-13.6
2018-03-31	-8.4
2018-06-30	-5
2018-09-30	-12.8
2018-12-31	-4.8
2019-03-31	-10.4
2019-06-30	-1.5
2019-09-30	10
2019-12-31	11.9
2020-03-31	25.6
2020-06-30	14.6
2020-09-30	6.1
2020-12-31	10.8
2021-03-31	-0.3
2021-06-30	-1.7
2021-09-30	-5.4
2021-12-31	-15.6
2022-03-31	-16.3
2022-06-30	-16.9
2022-09-30	-9.2
2022-12-31	-3
2023-03-31	0.5
2023-06-30	1.2
2023-09-30	-8.3
2023-12-31	-13