Quarter	Percent
1997-03-31	28.5
1997-06-30	35.4
1997-09-30	10.2
1997-12-31	10.8
1998-03-31	24
1998-06-30	17.3
1998-09-30	10.5
1998-12-31	3.2
1999-03-31	6.5
1999-06-30	18.3
1999-09-30	4.2
1999-12-31	6.7
2000-03-31	25.9
2000-06-30	18.9
2000-09-30	10.7
2000-12-31	20
2001-03-31	24.9
2001-06-30	13
2001-09-30	-0.7
2001-12-31	-3.6
2002-03-31	3.9
2002-06-30	9.4
2002-09-30	7.9
2002-12-31	-0.3
2003-03-31	0
2003-06-30	9.3
2003-09-30	6.4
2003-12-31	10
2004-03-31	18.1
2004-06-30	17.2
2004-09-30	20.1
2004-12-31	19
2005-03-31	14.3
2005-06-30	9.4
2005-09-30	12
2005-12-31	16.5
2006-03-31	26.8
2006-06-30	45.3
2006-09-30	24
2006-12-31	4.5
2007-03-31	19
2007-06-30	32
2007-09-30	34.8
2007-12-31	24.4
2008-03-31	15
2008-06-30	35.1
2008-09-30	57.7
2008-12-31	69.3
2009-03-31	54.3
2009-06-30	8.3
2009-09-30	-2
2009-12-31	7
2010-03-31	3.4
2010-06-30	-0.7
2010-09-30	-8.3
2010-12-31	-13.2
2011-03-31	-5.9
2011-06-30	5
2011-09-30	0.6
2011-12-31	-13.9
2012-03-31	-23.7
2012-06-30	-21.5
2012-09-30	-10.9
2012-12-31	7.8
2013-03-31	0.2
2013-06-30	-12.9
2013-09-30	-0.3
2013-12-31	-8.8
2014-03-31	-27.9
2014-06-30	-22.1
2014-09-30	-8.7
2014-12-31	-8.8
2015-03-31	-9.3
2015-06-30	-7.2
2015-09-30	-3.6
2015-12-31	-3
2016-03-31	0.6
2016-06-30	7.8
2016-09-30	2.2
2016-12-31	1.2
2017-03-31	15.9
2017-06-30	19.2
2017-09-30	9.8
2017-12-31	2.8
2018-03-31	-4.5
2018-06-30	-2.7
2018-09-30	-1.6
2018-12-31	0.8
2019-03-31	6.6
2019-06-30	2
2019-09-30	11.2
2019-12-31	20
2020-03-31	18.4
2020-06-30	10.4
2020-09-30	-3.7
2020-12-31	-1.2
2021-03-31	-8.1
2021-06-30	-4.2
2021-09-30	1.3
2021-12-31	3.7
2022-03-31	13.1
2022-06-30	1.3
2022-09-30	3.5
2022-12-31	-7.5
2023-03-31	-21.8
2023-06-30	-11.3
2023-09-30	-3.9
2023-12-31	4.7