Quarter	Percent
1998-12-31	15.1
1999-03-31	17.1
1999-06-30	12.8
1999-09-30	11.4
1999-12-31	14.6
2000-03-31	14
2000-06-30	18.7
2000-09-30	22.1
2000-12-31	23.3
2001-03-31	24
2001-06-30	23.8
2001-09-30	24.3
2001-12-31	22.8
2002-03-31	20.9
2002-06-30	21.1
2002-09-30	20
2002-12-31	19.9
2003-03-31	21.9
2003-06-30	23.3
2003-09-30	20.6
2003-12-31	16.8
2004-03-31	15.5
2004-06-30	16.6
2004-09-30	16.5
2004-12-31	16.4
2005-03-31	18.8
2005-06-30	18.7
2005-09-30	19.9
2005-12-31	21.2
2006-03-31	19.1
2006-06-30	18.4
2006-09-30	18.3
2006-12-31	18.3
2007-03-31	17.4
2007-06-30	18.5
2007-09-30	20.9
2007-12-31	21.5
2008-03-31	22.5
2008-06-30	19.6
2008-09-30	16.1
2008-12-31	12.7
2009-03-31	8.6
2009-06-30	4.6
2009-09-30	1.1
2009-12-31	-0.6
2010-03-31	-1.7
2010-06-30	-2.3
2010-09-30	-3.1
2010-12-31	-3.4
2011-03-31	-2.7
2011-06-30	-1.2
2011-09-30	-0.2
2011-12-31	-0.2
2012-03-31	-2.9
2012-06-30	-4.1
2012-09-30	-5
2012-12-31	-5.3
2013-03-31	-4.5
2013-06-30	-4.8
2013-09-30	-5.6
2013-12-31	-7.3
2014-03-31	-8.3
2014-06-30	-8.3
2014-09-30	-7.4
2014-12-31	-6.1
2015-03-31	-4.4
2015-06-30	-3.8
2015-09-30	-2.2
2015-12-31	-0.3
2016-03-31	1.5
2016-06-30	2.5
2016-09-30	2.2
2016-12-31	2
2017-03-31	0.4
2017-06-30	-0.3
2017-09-30	-2.1
2017-12-31	-2
2018-03-31	-1.7
2018-06-30	-1.8
2018-09-30	2.3
2018-12-31	3.2
2019-03-31	4
2019-06-30	6.3
2019-09-30	5.2
2019-12-31	4.8
2020-03-31	7.2
2020-06-30	6.4
2020-09-30	4.2
2020-12-31	2.8
2021-03-31	0.6
2021-06-30	-0.9
2021-09-30	-1.2
2021-12-31	0.6
2022-03-31	0.2
2022-06-30	2.4
2022-09-30	3.5
2022-12-31	4.2
2023-03-31	4.2
2023-06-30	3.9
2023-09-30	4.8
2023-12-31	5.1