Quarter	Percent
1987-06-30	34.5
1987-09-30	34.1
1987-12-31	26.3
1988-03-31	28.1
1988-06-30	28.2
1988-09-30	36.8
1988-12-31	15
1989-03-31	25.7
1989-06-30	27.2
1989-09-30	24.4
1989-12-31	12
1990-03-31	9.5
1990-06-30	13
1990-09-30	10.5
1990-12-31	1.9
1991-03-31	8.5
1991-06-30	5.2
1991-09-30	5.1
1991-12-31	-0.7
1992-03-31	0.9
1992-06-30	-2.6
1992-09-30	6.7
1992-12-31	-0.8
1993-03-31	2.5
1993-06-30	3.9
1993-09-30	10.8
1993-12-31	4
1994-03-31	9.2
1994-06-30	10.3
1994-09-30	14.6
1994-12-31	9.4
1995-03-31	14.2
1995-06-30	9.9
1995-09-30	17.7
1995-12-31	12.9
1996-03-31	13.8
1996-06-30	14.2
1996-09-30	24.4
1996-12-31	12.7
1997-03-31	15.9
1997-06-30	17.5
1997-09-30	12
1997-12-31	13.8
1998-03-31	19.6
1998-06-30	13.6
1998-09-30	16.2
1998-12-31	9.6
1999-03-31	16.2
1999-06-30	13.2
1999-09-30	14.2
1999-12-31	9.4
2000-03-31	15.9
2000-06-30	10.1
2000-09-30	8.3
2000-12-31	7.9
2001-03-31	14
2001-06-30	14.7
2001-09-30	13.7
2001-12-31	13.8
2002-03-31	17.2
2002-06-30	13.8
2002-09-30	16.4
2002-12-31	12.2
2003-03-31	13.8
2003-06-30	12.2
2003-09-30	11.4
2003-12-31	8.2
2004-03-31	15.4
2004-06-30	12.7
2004-09-30	11.5
2004-12-31	8
2005-03-31	14.1
2005-06-30	11.1
2005-09-30	8.8
2005-12-31	4.9
2006-03-31	9.5
2006-06-30	7.6
2006-09-30	7.6
2006-12-31	5.3
2007-03-31	7.3
2007-06-30	8.6
2007-09-30	8
2007-12-31	4.9
2008-03-31	9.4
2008-06-30	6.3
2008-09-30	2.1
2008-12-31	-0.1
2009-03-31	4.3
2009-06-30	2.3
2009-09-30	-3.9
2009-12-31	-2.6
2010-03-31	2.3
2010-06-30	1.8
2010-09-30	-2.6
2010-12-31	0.2
2011-03-31	3.3
2011-06-30	4.5
2011-09-30	0.7
2011-12-31	-1.4
2012-03-31	5.8
2012-06-30	6.7
2012-09-30	3.4
2012-12-31	5.9
2013-03-31	8.7
2013-06-30	10.4
2013-09-30	8.2
2013-12-31	6.7
2014-03-31	12.9
2014-06-30	14.5
2014-09-30	9.7
2014-12-31	8.6
2015-03-31	15.3
2015-06-30	16.3
2015-09-30	10.3
2015-12-31	10.2
2016-03-31	16.8
2016-06-30	17.9
2016-09-30	10.1
2016-12-31	10
2017-03-31	15.6
2017-06-30	17
2017-09-30	10.4
2017-12-31	9.9
2018-03-31	13
2018-06-30	17.5
2018-09-30	8.4
2018-12-31	8
2019-03-31	12.5
2019-06-30	15
2019-09-30	8.1
2019-12-31	7.3
2020-03-31	9.5
2020-06-30	3.5
2020-09-30	5
2020-12-31	6.8
2021-03-31	4.6
2021-06-30	12.7
2021-09-30	4.8
2021-12-31	6.3
2022-03-31	10.3
2022-06-30	15.1
2022-09-30	6.8
2022-12-31	6.6
2023-03-31	11