Quarter	Percent
2001-03-31	29.2
2001-06-30	26.2
2001-09-30	25.3
2001-12-31	31.9
2002-03-31	29.8
2002-06-30	32.7
2002-09-30	35.6
2002-12-31	34
2003-03-31	22.3
2003-06-30	20
2003-09-30	21.1
2003-12-31	23
2004-03-31	22
2004-06-30	26.3
2004-09-30	23.7
2004-12-31	26.5
2005-03-31	31.3
2005-06-30	39.1
2005-09-30	38.9
2005-12-31	50.5
2006-03-31	56.6
2006-06-30	51.6
2006-09-30	55.6
2006-12-31	63.8
2007-03-31	62.4
2007-06-30	68.6
2007-09-30	72.4
2007-12-31	71.5
2008-03-31	71.9
2008-06-30	60.4
2008-09-30	64.4
2008-12-31	66.5
2009-03-31	61.1
2009-06-30	59.6
2009-09-30	54.8
2009-12-31	49.2
2010-03-31	41
2010-06-30	1
2010-09-30	-0.9
2010-12-31	-4
2011-03-31	-2.8
2011-06-30	-1.3
2011-09-30	-2.8
2011-12-31	-7.1
2012-03-31	-10.2
2012-06-30	-10.7
2012-09-30	-8.7
2012-12-31	-1.3
2013-03-31	0.5
2013-06-30	2.3
2013-09-30	1.1
2013-12-31	-3.6
2014-03-31	-4.5
2014-06-30	-7.5
2014-09-30	-8.7
2014-12-31	-7.7
2015-03-31	-6
2015-06-30	-4.6
2015-09-30	-4
2015-12-31	-2
2016-03-31	-1
2016-06-30	3.2
2016-09-30	6.4
2016-12-31	6.5
2017-03-31	8.1
2017-06-30	6.5
2017-09-30	6.2
2017-12-31	6.2
2018-03-31	2.8
2018-06-30	2
2018-09-30	1.5
2018-12-31	4.3
2019-03-31	1.1
2019-06-30	0.5
2019-09-30	0.4
2019-12-31	-1.1
2020-03-31	13.9
2020-06-30	15.2
2020-09-30	15.9
2020-12-31	16.3
2021-03-31	5.8
2021-06-30	5.5
2021-09-30	6.9
2021-12-31	6
2022-03-31	8.2
2022-06-30	5.3
2022-09-30	6.1
2022-12-31	1.2
2023-03-31	-2.7
2023-06-30	-1.3
2023-09-30	-4.5
2023-12-31	0.6