Quarter	Percent
1987-12-31	32.9
1988-03-31	28.2
1988-06-30	30.3
1988-09-30	27.4
1988-12-31	30
1989-03-31	30
1989-06-30	27.4
1989-09-30	26.1
1989-12-31	20.8
1990-03-31	22.8
1990-06-30	21.6
1990-09-30	20.5
1990-12-31	20.7
1991-03-31	18.9
1991-06-30	15.1
1991-09-30	11.3
1991-12-31	7.3
1992-03-31	2.8
1992-06-30	2.3
1992-09-30	2.4
1992-12-31	1.9
1993-03-31	4.9
1993-06-30	3.3
1993-09-30	4.3
1993-12-31	7.6
1994-03-31	1.6
1994-06-30	2.8
1994-09-30	2.6
1994-12-31	1.6
1995-03-31	5.3
1995-06-30	6.6
1995-09-30	7.2
1995-12-31	9.1
1996-03-31	14.5
1996-06-30	16.4
1996-09-30	16.8
1996-12-31	11.2
1997-03-31	19.1
1997-06-30	16.7
1997-09-30	11.4
1997-12-31	16.7
1998-03-31	9.3
1998-06-30	5.3
1998-09-30	13.4
1998-12-31	-0.3
1999-03-31	5
1999-06-30	6.4
1999-09-30	2.9
1999-12-31	13.3
2000-03-31	8.9
2000-06-30	10.7
2000-09-30	8.8
2000-12-31	11.9
2001-03-31	14.1
2001-06-30	5.9
2001-09-30	10.6
2001-12-31	4.6
2002-03-31	-2.2
2002-06-30	6.9
2002-09-30	1.5
2002-12-31	0.4
2003-03-31	-0.1
2003-06-30	-1.3
2003-09-30	3.1
2003-12-31	8.6
2004-03-31	4.7
2004-06-30	3.6
2004-09-30	7.6
2004-12-31	8.4
2005-03-31	5.9
2005-06-30	12.4
2005-09-30	5.8
2005-12-31	5.4
2006-03-31	14.8
2006-06-30	16.5
2006-09-30	21.4
2006-12-31	18.5
2007-03-31	28.9
2007-06-30	22.9
2007-09-30	24.6
2007-12-31	24.2
2008-03-31	11.9
2008-06-30	16.8
2008-09-30	19.9
2008-12-31	28.6
2009-03-31	30.3
2009-06-30	18.9
2009-09-30	9.8
2009-12-31	2.4
2010-03-31	-5.6
2010-06-30	-3.7
2010-09-30	-1.8
2010-12-31	-0.4
2011-03-31	1.7
2011-06-30	1.9
2011-09-30	-3.8
2011-12-31	-10.3
2012-03-31	-8.2
2012-06-30	-10.2
2012-09-30	-7.9
2012-12-31	1.5
2013-03-31	0.5
2013-06-30	-0.9
2013-09-30	0.9
2013-12-31	-7.1
2014-03-31	-18.7
2014-06-30	-23.2
2014-09-30	-27.2
2014-12-31	-30.2
2015-03-31	-16.7
2015-06-30	-9.5
2015-09-30	-2.4
2015-12-31	3.7
2016-03-31	0.2
2016-06-30	-5.5
2016-09-30	-11.2
2016-12-31	-11.6
2017-03-31	-15.1
2017-06-30	-6.1
2017-09-30	-2.1
2017-12-31	0.9
2018-03-31	13.1
2018-06-30	14.8
2018-09-30	17.6
2018-12-31	14.3
2019-03-31	11
2019-06-30	8.6
2019-09-30	5.2
2019-12-31	12.1
2020-03-31	10.2
2020-06-30	7.1
2020-09-30	1.4
2020-12-31	0.5
2021-03-31	-4.9
2021-06-30	2.7
2021-09-30	1.5
2021-12-31	-3.7
2022-03-31	10.3
2022-06-30	-0.6
2022-09-30	11.6
2022-12-31	10.3
2023-03-31	-1.4
2023-06-30	4.7
2023-09-30	1.3
2023-12-31	11.3