Quarter	Percent
1987-12-31	30.1
1988-03-31	7.5
1988-06-30	9.5
1988-09-30	10.8
1988-12-31	8.9
1989-03-31	32.3
1989-06-30	36
1989-09-30	36.1
1989-12-31	39.1
1990-03-31	38.2
1990-06-30	27.5
1990-09-30	27.1
1990-12-31	36.2
1991-03-31	34.3
1991-06-30	30.9
1991-09-30	27
1991-12-31	11.2
1992-03-31	10.1
1992-06-30	8
1992-09-30	7.4
1992-12-31	6.8
1993-03-31	1.6
1993-06-30	-0.1
1993-09-30	-1.6
1993-12-31	-2.3
1994-03-31	0.3
1994-06-30	-0.5
1994-09-30	1.1
1994-12-31	2.3
1995-03-31	2.3
1995-06-30	4.2
1995-09-30	6.7
1995-12-31	10.4
1996-03-31	20
1996-06-30	23
1996-09-30	20.2
1996-12-31	19.6
1997-03-31	17.8
1997-06-30	16.9
1997-09-30	23.9
1997-12-31	19.8
1998-03-31	14.2
1998-06-30	11.7
1998-09-30	3.7
1998-12-31	8
1999-03-31	6.5
1999-06-30	5.8
1999-09-30	9.2
1999-12-31	4.4
2000-03-31	3.3
2000-06-30	2.4
2000-09-30	-2.1
2000-12-31	-2.1
2001-03-31	-3.1
2001-06-30	-1.7
2001-09-30	-0.7
2001-12-31	0.3
2002-03-31	-0.7
2002-06-30	-1.4
2002-09-30	4.8
2002-12-31	1.3
2003-03-31	2.6
2003-06-30	4.7
2003-09-30	0.5
2003-12-31	-0.7
2004-03-31	-6.4
2004-06-30	-6.7
2004-09-30	-8
2004-12-31	-4.6
2005-03-31	-0.8
2005-06-30	2
2005-09-30	3.9
2005-12-31	2.9
2006-03-31	7.9
2006-06-30	5.7
2006-09-30	3.8
2006-12-31	8.1
2007-03-31	2.6
2007-06-30	3
2007-09-30	3.3
2007-12-31	-0.2
2008-03-31	5.6
2008-06-30	1.5
2008-09-30	-1.6
2008-12-31	0.2
2009-03-31	-5.9
2009-06-30	-4.9
2009-09-30	-12.3
2009-12-31	-13.9
2010-03-31	-11.9
2010-06-30	-12.9
2010-09-30	-7.7
2010-12-31	-9.3
2011-03-31	-11.8
2011-06-30	9.5
2011-09-30	10.8
2011-12-31	11.9
2012-03-31	14.7
2012-06-30	-5.4
2012-09-30	-2.2
2012-12-31	-5.9
2013-03-31	-8.1
2013-06-30	-12.6
2013-09-30	-14.7
2013-12-31	-10.6
2014-03-31	-5.5
2014-06-30	3
2014-09-30	5.9
2014-12-31	8.6
2015-03-31	6.2
2015-06-30	2
2015-09-30	2.1
2015-12-31	-1.4
2016-03-31	-4.7
2016-06-30	-5.4
2016-09-30	-4.7
2016-12-31	-0.6
2017-03-31	2.8
2017-06-30	6.2
2017-09-30	11.6
2017-12-31	7.7
2018-03-31	16.4
2018-06-30	23.3
2018-09-30	30
2018-12-31	41.4
2019-03-31	35.2
2019-06-30	21.1
2019-09-30	8.2
2019-12-31	6.3
2020-03-31	4.9
2020-06-30	7.6
2020-09-30	3.4
2020-12-31	-2.3
2021-03-31	-3
2021-06-30	-9
2021-09-30	-6.8
2021-12-31	-15.4
2022-03-31	-14.1
2022-06-30	-6.9
2022-09-30	-4.9
2022-12-31	9.6
2023-03-31	10
2023-06-30	14
2023-09-30	15
2023-12-31	12.4