Quarter	Percent
1987-12-31	23.3
1988-03-31	24.9
1988-06-30	28
1988-09-30	29.3
1988-12-31	29.5
1989-03-31	28.5
1989-06-30	26.4
1989-09-30	24.6
1989-12-31	22.1
1990-03-31	21
1990-06-30	18.6
1990-09-30	15.1
1990-12-31	14
1991-03-31	10.9
1991-06-30	7.8
1991-09-30	5.3
1991-12-31	3.2
1992-03-31	1.2
1992-06-30	1.3
1992-09-30	1.7
1992-12-31	1.4
1993-03-31	1.4
1993-06-30	1
1993-09-30	1
1993-12-31	1.1
1994-03-31	0.5
1994-06-30	0.4
1994-09-30	0.8
1994-12-31	1.9
1995-03-31	4.5
1995-06-30	5.9
1995-09-30	7
1995-12-31	8
1996-03-31	9
1996-06-30	9.4
1996-09-30	9.2
1996-12-31	8.1
1997-03-31	8.6
1997-06-30	9.4
1997-09-30	8.7
1997-12-31	9
1998-03-31	8.1
1998-06-30	6.3
1998-09-30	7.1
1998-12-31	5.6
1999-03-31	6.1
1999-06-30	6.7
1999-09-30	6.4
1999-12-31	8.2
2000-03-31	8.9
2000-06-30	10.7
2000-09-30	10.4
2000-12-31	10.9
2001-03-31	9.8
2001-06-30	7.2
2001-09-30	9
2001-12-31	7.3
2002-03-31	6.3
2002-06-30	8.5
2002-09-30	8.8
2002-12-31	10.3
2003-03-31	9.6
2003-06-30	9.5
2003-09-30	9
2003-12-31	9.2
2004-03-31	10.5
2004-06-30	10.7
2004-09-30	11.5
2004-12-31	11.3
2005-03-31	9.4
2005-06-30	10.1
2005-09-30	9.3
2005-12-31	9.6
2006-03-31	10.9
2006-06-30	10.8
2006-09-30	11.6
2006-12-31	10.2
2007-03-31	12.2
2007-06-30	10.7
2007-09-30	12
2007-12-31	12.4
2008-03-31	12.6
2008-06-30	13.1
2008-09-30	10.8
2008-12-31	8.8
2009-03-31	7.4
2009-06-30	3.5
2009-09-30	0.8
2009-12-31	0.9
2010-03-31	-1.9
2010-06-30	-0.7
2010-09-30	-1
2010-12-31	-2.3
2011-03-31	-1.9
2011-06-30	-1.2
2011-09-30	-0.9
2011-12-31	-1.4
2012-03-31	-1.7
2012-06-30	-2.4
2012-09-30	-2.2
2012-12-31	0.6
2013-03-31	0.4
2013-06-30	-0.3
2013-09-30	0.7
2013-12-31	-1.6
2014-03-31	-3.5
2014-06-30	-3.2
2014-09-30	-4.2
2014-12-31	-4
2015-03-31	-0.1
2015-06-30	0
2015-09-30	1.4
2015-12-31	2.7
2016-03-31	3
2016-06-30	4.4
2016-09-30	4
2016-12-31	4.7
2017-03-31	4.5
2017-06-30	4.5
2017-09-30	4.9
2017-12-31	4.5
2018-03-31	3.4
2018-06-30	3
2018-09-30	3.3
2018-12-31	4.4
2019-03-31	5.1
2019-06-30	4.7
2019-09-30	5.6
2019-12-31	5
2020-03-31	7.1
2020-06-30	6.9
2020-09-30	4.1
2020-12-31	4
2021-03-31	0.5
2021-06-30	2.1
2021-09-30	1.8
2021-12-31	2.1
2022-03-31	4.1
2022-06-30	2.5
2022-09-30	4.5
2022-12-31	1.5
2023-03-31	-1
2023-06-30	-1.7
2023-09-30	-3.2
2023-12-31	-0.7