Quarter	Percent
1997-09-30	6.9
1997-12-31	6.9
1998-03-31	6.8
1998-06-30	6.8
1998-09-30	7.3
1998-12-31	7.4
1999-03-31	7.6
1999-06-30	7.9
1999-09-30	8.5
1999-12-31	9.3
2000-03-31	9.8
2000-06-30	10.1
2000-09-30	9.7
2000-12-31	9.5
2001-03-31	9.2
2001-06-30	9.4
2001-09-30	10.1
2001-12-31	10.6
2002-03-31	11.2
2002-06-30	12
2002-09-30	12.8
2002-12-31	13.6
2003-03-31	13.8
2003-06-30	13.8
2003-09-30	13.9
2003-12-31	13.9
2004-03-31	14.1
2004-06-30	14.1
2004-09-30	13.6
2004-12-31	12.5
2005-03-31	11.7
2005-06-30	10.8
2005-09-30	10.1
2005-12-31	10
2006-03-31	9.8
2006-06-30	9.9
2006-09-30	10.1
2006-12-31	10.3
2007-03-31	10.2
2007-06-30	9.8
2007-09-30	9.4
2007-12-31	8.6
2008-03-31	8.5
2008-06-30	7.7
2008-09-30	6.3
2008-12-31	5.4
2009-03-31	3.8
2009-06-30	2.6
2009-09-30	2
2009-12-31	1.7
2010-03-31	1.6
2010-06-30	1.4
2010-09-30	1.3
2010-12-31	0.9
2011-03-31	0.9
2011-06-30	0.9
2011-09-30	0.9
2011-12-31	0.8
2012-03-31	0.8
2012-06-30	0.7
2012-09-30	0.6
2012-12-31	0.7
2013-03-31	0.7
2013-06-30	0.8
2013-09-30	1.1
2013-12-31	1.3
2014-03-31	1.7
2014-06-30	2.2
2014-09-30	2.4
2014-12-31	2.5
2015-03-31	2.4
2015-06-30	2.4
2015-09-30	2.8
2015-12-31	3.4
2016-03-31	4.2
2016-06-30	4.1
2016-09-30	4
2016-12-31	3.9
2017-03-31	3.7
2017-06-30	4
2017-09-30	3.9
2017-12-31	3.7
2018-03-31	3.5
2018-06-30	3.4
2018-09-30	3.3
2018-12-31	3.2
2019-03-31	3.1
2019-06-30	3
2019-09-30	3.1
2019-12-31	3.2
2020-03-31	3.1
2020-06-30	2.1
2020-09-30	1.9
2020-12-31	2.1
2021-03-31	2.7
2021-06-30	4.5
2021-09-30	4.5
2021-12-31	4.1
2022-03-31	4.1
2022-06-30	3.7
2022-09-30	4
2022-12-31	4
2023-03-31	3.1
2023-06-30	2
2023-09-30	1.1
2023-12-31	0.5