Quarter	Percent
1987-12-31	11.4
1988-03-31	8.2
1988-06-30	21.6
1988-09-30	4.4
1988-12-31	2.3
1989-03-31	10.9
1989-06-30	21.4
1989-09-30	17.5
1989-12-31	27.7
1990-03-31	16.5
1990-06-30	6.1
1990-09-30	6.4
1990-12-31	-2.4
1991-03-31	-3.9
1991-06-30	-22.2
1991-09-30	-13
1991-12-31	-6.4
1992-03-31	-3.8
1992-06-30	1.8
1992-09-30	16.4
1992-12-31	20.3
1993-03-31	44.9
1993-06-30	33.8
1993-09-30	4.9
1993-12-31	-6.6
1994-03-31	-28.3
1994-06-30	-14.9
1994-09-30	-3.8
1994-12-31	3
1995-03-31	172
1995-06-30	83
1995-09-30	13
1995-12-31	6.1
1996-03-31	-51.9
1996-06-30	-22.7
1996-09-30	20.7
1996-12-31	16.4
1997-03-31	21.8
1997-06-30	6.4
1997-09-30	43
1997-12-31	41.3
1998-03-31	27.3
1998-06-30	45.2
1998-09-30	19.6
1998-12-31	18.9
1999-03-31	9.1
1999-06-30	5.4
1999-09-30	-15.4
1999-12-31	-13.3
2000-03-31	-12.7
2000-06-30	-20.3
2000-09-30	-9.7
2000-12-31	-6
2001-03-31	-3.1
2001-06-30	-3.1
2001-09-30	0.7
2001-12-31	-5.3
2002-03-31	-3.2
2002-06-30	-3.1
2002-09-30	-5.1
2002-12-31	-5.3
2003-03-31	-10.8
2003-06-30	-8.3
2003-09-30	-14.7
2003-12-31	-15.5
2004-03-31	-15.7
2004-06-30	-16.8
2004-09-30	-18.7
2004-12-31	-19
2005-03-31	-20
2005-06-30	-13
2005-09-30	-4
2005-12-31	11.3
2006-03-31	37.2
2006-06-30	25.7
2006-09-30	15.7
2006-12-31	1
2007-03-31	-18.2
2007-06-30	-13.8
2007-09-30	-4.1
2007-12-31	-3.4
2008-03-31	8.7
2008-06-30	7.9
2008-09-30	1.5
2008-12-31	11
2009-03-31	5.8
2009-06-30	-1.4
2009-09-30	-6.7
2009-12-31	-16.4
2010-03-31	-21.5
2010-06-30	-14.2
2010-09-30	-7.4
2010-12-31	1.2
2011-03-31	-9.7
2011-06-30	-6.6
2011-09-30	-15.2
2011-12-31	-12.6
2012-03-31	2.3
2012-06-30	-0.1
2012-09-30	14.6
2012-12-31	4.6
2013-03-31	-5.4
2013-06-30	-11.9
2013-09-30	-16.4
2013-12-31	-5
2014-03-31	1.8
2014-06-30	24.4
2014-09-30	21
2014-12-31	15.4
2015-03-31	18.1
2015-06-30	-1.2
2015-09-30	9.5
2015-12-31	11.5
2016-03-31	23.3
2016-06-30	18.5
2016-09-30	18.9
2016-12-31	17.9
2017-03-31	-4.7
2017-06-30	-4.9
2017-09-30	-11.4
2017-12-31	-9.3
2018-03-31	-2.7
2018-06-30	81.5
2018-09-30	83.1
2018-12-31	82.8
2019-03-31	80.2
2019-06-30	5.6
2019-09-30	-2.2
2019-12-31	-29.1
2020-03-31	-11.2
2020-06-30	-38.7
2020-09-30	-41.4
2020-12-31	-2.9
2021-03-31	-36.7
2021-06-30	-11.1
2021-09-30	-6.4
2021-12-31	-17.3
2022-03-31	29.8
2022-06-30	40.1
2022-09-30	53.9
2022-12-31	29.4
2023-03-31	-3.4
2023-06-30	-4.3
2023-09-30	-2.1
2023-12-31	-9.9