Quarter	Percent
1997-09-30	19
1997-12-31	22.5
1998-03-31	16.9
1998-06-30	14
1998-09-30	17.1
1998-12-31	10
1999-03-31	8.5
1999-06-30	10.5
1999-09-30	5.4
1999-12-31	12.3
2000-03-31	14.5
2000-06-30	12.6
2000-09-30	18
2000-12-31	19.4
2001-03-31	17.6
2001-06-30	16.4
2001-09-30	11.4
2001-12-31	4.4
2002-03-31	1.6
2002-06-30	2.7
2002-09-30	5.9
2002-12-31	4.4
2003-03-31	3.9
2003-06-30	4.4
2003-09-30	3.1
2003-12-31	9.6
2004-03-31	12.1
2004-06-30	13.6
2004-09-30	19.1
2004-12-31	18.1
2005-03-31	17.1
2005-06-30	14.1
2005-09-30	13.2
2005-12-31	12.9
2006-03-31	19.2
2006-06-30	30.1
2006-09-30	25.4
2006-12-31	23.3
2007-03-31	21.4
2007-06-30	17.5
2007-09-30	26.6
2007-12-31	28.2
2008-03-31	24.5
2008-06-30	29.7
2008-09-30	34.7
2008-12-31	51.3
2009-03-31	56
2009-06-30	35.4
2009-09-30	22.9
2009-12-31	7.7
2010-03-31	0.7
2010-06-30	3.1
2010-09-30	-2.6
2010-12-31	-7.2
2011-03-31	-7.1
2011-06-30	-4.6
2011-09-30	-2.7
2011-12-31	-4.9
2012-03-31	-12.4
2012-06-30	-17.8
2012-09-30	-17.5
2012-12-31	-8
2013-03-31	-5.5
2013-06-30	-3.1
2013-09-30	0
2013-12-31	-10.9
2014-03-31	-15.2
2014-06-30	-15.7
2014-09-30	-18.9
2014-12-31	-15.7
2015-03-31	-9
2015-06-30	-8
2015-09-30	-6.5
2015-12-31	-5.1
2016-03-31	-1.5
2016-06-30	2.3
2016-09-30	1.4
2016-12-31	4.4
2017-03-31	8.8
2017-06-30	9.8
2017-09-30	12.8
2017-12-31	10.7
2018-03-31	2.4
2018-06-30	0
2018-09-30	-3.1
2018-12-31	-1
2019-03-31	2.4
2019-06-30	1.4
2019-09-30	8.8
2019-12-31	10.6
2020-03-31	14.7
2020-06-30	15.1
2020-09-30	6.8
2020-12-31	4.5
2021-03-31	-5.9
2021-06-30	-2.7
2021-09-30	-3.5
2021-12-31	-0.3
2022-03-31	7
2022-06-30	2.5
2022-09-30	8.2
2022-12-31	-3.2
2023-03-31	-10
2023-06-30	-9.4
2023-09-30	-13.3
2023-12-31	-3.6