Quarter	Percent
1998-12-31	11.9
1999-03-31	14.2
1999-06-30	12.6
1999-09-30	10.9
1999-12-31	12
2000-03-31	12.2
2000-06-30	19.3
2000-09-30	21.7
2000-12-31	23.4
2001-03-31	22.5
2001-06-30	20.2
2001-09-30	21.6
2001-12-31	20.9
2002-03-31	18.3
2002-06-30	17
2002-09-30	15.4
2002-12-31	15
2003-03-31	16.5
2003-06-30	20.1
2003-09-30	19.6
2003-12-31	16.4
2004-03-31	15.7
2004-06-30	15.4
2004-09-30	14.3
2004-12-31	14.2
2005-03-31	17.3
2005-06-30	16.9
2005-09-30	19.4
2005-12-31	21.1
2006-03-31	19.9
2006-06-30	20.6
2006-09-30	19.8
2006-12-31	19.8
2007-03-31	17.7
2007-06-30	16.7
2007-09-30	19.7
2007-12-31	19.9
2008-03-31	20.6
2008-06-30	19.4
2008-09-30	14.1
2008-12-31	10.1
2009-03-31	6.6
2009-06-30	1.8
2009-09-30	-1.2
2009-12-31	-2.9
2010-03-31	-4.2
2010-06-30	-4
2010-09-30	-5.1
2010-12-31	-5
2011-03-31	-4.3
2011-06-30	-3.2
2011-09-30	-1.4
2011-12-31	-1.6
2012-03-31	-3.9
2012-06-30	-4.8
2012-09-30	-5.5
2012-12-31	-5.8
2013-03-31	-4.5
2013-06-30	-3.8
2013-09-30	-4
2013-12-31	-4.7
2014-03-31	-5.7
2014-06-30	-5.7
2014-09-30	-4.9
2014-12-31	-3.7
2015-03-31	-1.7
2015-06-30	-3.6
2015-09-30	-1.5
2015-12-31	-0.5
2016-03-31	1.6
2016-06-30	5.4
2016-09-30	4.5
2016-12-31	5
2017-03-31	2.8
2017-06-30	1.6
2017-09-30	-0.5
2017-12-31	-1.4
2018-03-31	-1.4
2018-06-30	-0.7
2018-09-30	2
2018-12-31	3.9
2019-03-31	5.2
2019-06-30	5.7
2019-09-30	5.2
2019-12-31	3.8
2020-03-31	6.3
2020-06-30	5.7
2020-09-30	4.3
2020-12-31	3.4
2021-03-31	0.1
2021-06-30	-2
2021-09-30	-2.3
2021-12-31	-0.6
2022-03-31	0.3
2022-06-30	3.3
2022-09-30	4
2022-12-31	4.9
2023-03-31	3.2
2023-06-30	1.8
2023-09-30	3.3
2023-12-31	3.1