Quarter	Percent
1997-09-30	2.4
1997-12-31	3.5
1998-03-31	3.8
1998-06-30	4.6
1998-09-30	5.8
1998-12-31	6.3
1999-03-31	7.2
1999-06-30	6.7
1999-09-30	8.4
1999-12-31	10.9
2000-03-31	12.3
2000-06-30	14.4
2000-09-30	16.1
2000-12-31	15.7
2001-03-31	13.9
2001-06-30	11.7
2001-09-30	10
2001-12-31	10.3
2002-03-31	9.9
2002-06-30	11.3
2002-09-30	12
2002-12-31	12.2
2003-03-31	11.6
2003-06-30	12
2003-09-30	11.5
2003-12-31	11.2
2004-03-31	11.2
2004-06-30	11.7
2004-09-30	12.8
2004-12-31	10.6
2005-03-31	12.4
2005-06-30	13.9
2005-09-30	13.3
2005-12-31	16.9
2006-03-31	17.4
2006-06-30	15.8
2006-09-30	16.3
2006-12-31	16.8
2007-03-31	14.7
2007-06-30	14.8
2007-09-30	14.7
2007-12-31	10.3
2008-03-31	10
2008-06-30	10.1
2008-09-30	7.9
2008-12-31	6.3
2009-03-31	2.8
2009-06-30	-1.2
2009-09-30	-3.2
2009-12-31	-2.3
2010-03-31	-2.1
2010-06-30	-2.2
2010-09-30	-2.8
2010-12-31	-3.6
2011-03-31	-3.7
2011-06-30	-3.7
2011-09-30	-2
2011-12-31	-2.2
2012-03-31	-3.6
2012-06-30	-4
2012-09-30	-5.4
2012-12-31	-5.1
2013-03-31	-3.8
2013-06-30	-4.5
2013-09-30	-4.6
2013-12-31	-6.1
2014-03-31	-6.2
2014-06-30	-5.5
2014-09-30	-4.4
2014-12-31	-3.3
2015-03-31	-3.5
2015-06-30	-2.7
2015-09-30	-2.7
2015-12-31	-1.4
2016-03-31	-0.7
2016-06-30	-1.4
2016-09-30	-1.9
2016-12-31	-2.8
2017-03-31	-3.1
2017-06-30	-3.3
2017-09-30	-3.4
2017-12-31	-4
2018-03-31	-4.1
2018-06-30	-3.1
2018-09-30	-3
2018-12-31	-3
2019-03-31	-2.9
2019-06-30	-3.6
2019-09-30	-3.8
2019-12-31	-3.8
2020-03-31	-3.7
2020-06-30	14.3
2020-09-30	22.2
2020-12-31	27.3
2021-03-31	28.2
2021-06-30	7
2021-09-30	-1
2021-12-31	-5.8
2022-03-31	-8
2022-06-30	-9.3
2022-09-30	-9.6
2022-12-31	-10.8
2023-03-31	-11
2023-06-30	-10.1
2023-09-30	-10
2023-12-31	-8.9