Quarter	Percent
1998-12-31	13.6
1999-03-31	10.8
1999-06-30	11.4
1999-09-30	14.9
1999-12-31	15
2000-03-31	16.6
2000-06-30	16.3
2000-09-30	12.5
2000-12-31	7.2
2001-03-31	7.2
2001-06-30	8.8
2001-09-30	7.5
2001-12-31	9.6
2002-03-31	11.7
2002-06-30	16
2002-09-30	15.7
2002-12-31	15.5
2003-03-31	17.9
2003-06-30	13.5
2003-09-30	14.7
2003-12-31	12.2
2004-03-31	12.6
2004-06-30	13.9
2004-09-30	17.5
2004-12-31	15.6
2005-03-31	15.8
2005-06-30	16.8
2005-09-30	15.1
2005-12-31	20.9
2006-03-31	24.6
2006-06-30	21.9
2006-09-30	21.4
2006-12-31	18.7
2007-03-31	14.7
2007-06-30	11.8
2007-09-30	13.8
2007-12-31	15.8
2008-03-31	17.2
2008-06-30	22
2008-09-30	19.7
2008-12-31	19.8
2009-03-31	19.2
2009-06-30	16.6
2009-09-30	16.4
2009-12-31	11.9
2010-03-31	11
2010-06-30	8.7
2010-09-30	5.8
2010-12-31	4.7
2011-03-31	3.5
2011-06-30	7
2011-09-30	7.2
2011-12-31	6
2012-03-31	5.2
2012-06-30	3
2012-09-30	1.8
2012-12-31	5.1
2013-03-31	7
2013-06-30	4.3
2013-09-30	2.5
2013-12-31	-1.8
2014-03-31	-4
2014-06-30	-1.3
2014-09-30	-0.3
2014-12-31	1.2
2015-03-31	1.1
2015-06-30	0.9
2015-09-30	-0.9
2015-12-31	-3.3
2016-03-31	-2.8
2016-06-30	-3.4
2016-09-30	-1.1
2016-12-31	-1.2
2017-03-31	-1.8
2017-06-30	-2.8
2017-09-30	-2.6
2017-12-31	-2.8
2018-03-31	-3.9
2018-06-30	-2.9
2018-09-30	-2.9
2018-12-31	-2.9
2019-03-31	-4
2019-06-30	-4.7
2019-09-30	-4.8
2019-12-31	-3.6
2020-03-31	7.7
2020-06-30	9.2
2020-09-30	5.4
2020-12-31	5
2021-03-31	-3.4
2021-06-30	-7
2021-09-30	-5.2
2021-12-31	-6.9
2022-03-31	-8.4
2022-06-30	-7.6
2022-09-30	-9
2022-12-31	-8.5
2023-03-31	-9.5
2023-06-30	-8.1
2023-09-30	-2.3
2023-12-31	-1.5