Quarter	Percent
2008-12-31	-0.8
2009-03-31	-3
2009-06-30	-3.8
2009-09-30	-4.5
2009-12-31	-4.6
2010-03-31	-4.3
2010-06-30	-5.2
2010-09-30	-5.3
2010-12-31	-4.5
2011-03-31	-3.6
2011-06-30	-2.9
2011-09-30	-2
2011-12-31	-3
2012-03-31	-3.7
2012-06-30	-4.3
2012-09-30	-4.5
2012-12-31	-3.3
2013-03-31	-1.1
2013-06-30	1.5
2013-09-30	4.1
2013-12-31	4.7
2014-03-31	6.2
2014-06-30	7.3
2014-09-30	8.2
2014-12-31	9.1
2015-03-31	10
2015-06-30	10
2015-09-30	10.2
2015-12-31	11.1
2016-03-31	11.2
2016-06-30	12
2016-09-30	12.1
2016-12-31	11.1
2017-03-31	10.5
2017-06-30	7.8
2017-09-30	5.3
2017-12-31	4.1
2018-03-31	1.6
2018-06-30	2.2
2018-09-30	2.4
2018-12-31	2.5
2019-03-31	3.2
2019-06-30	3.1
2019-09-30	3.5
2019-12-31	3.5
2020-03-31	3.3
2020-06-30	-1.2
2020-09-30	-4.4
2020-12-31	-6.5
2021-03-31	-8.9
2021-06-30	-5.3
2021-09-30	-2.7
2021-12-31	0.3
2022-03-31	3.5
2022-06-30	6.5
2022-09-30	8
2022-12-31	7.1
2023-03-31	6.9
2023-06-30	6
2023-09-30	5.4
2023-12-31	6.3