Quarter	Percent, Seasonally adjusted
1987-03-31	17.1
1987-06-30	19
1987-09-30	19.9
1987-12-31	22.9
1988-03-31	24.9
1988-06-30	24.7
1988-09-30	26.1
1988-12-31	23.6
1989-03-31	23.2
1989-06-30	22.5
1989-09-30	19.9
1989-12-31	19.2
1990-03-31	14.5
1990-06-30	11.6
1990-09-30	8.6
1990-12-31	6.6
1991-03-31	6.7
1991-06-30	5.5
1991-09-30	5.3
1991-12-31	4.9
1992-03-31	3.6
1992-06-30	2.1
1992-09-30	2.4
1992-12-31	1.8
1993-03-31	1.3
1993-06-30	2.1
1993-09-30	1.1
1993-12-31	0.6
1994-03-31	1.9
1994-06-30	3.8
1994-09-30	5.3
1994-12-31	7.5
1995-03-31	9.2
1995-06-30	9.3
1995-09-30	10.3
1995-12-31	11.7
1996-03-31	12.2
1996-06-30	13.3
1996-09-30	15
1996-12-31	14.8
1997-03-31	15.4
1997-06-30	17.4
1997-09-30	14.7
1997-12-31	15
1998-03-31	15.7
1998-06-30	14.5
1998-09-30	16.5
1998-12-31	16.9
1999-03-31	16
1999-06-30	15.4
1999-09-30	14.7
1999-12-31	14.2
2000-03-31	15
2000-06-30	14.6
2000-09-30	14.1
2000-12-31	14.6
2001-03-31	13.8
2001-06-30	15.3
2001-09-30	16.3
2001-12-31	16.5
2002-03-31	17.5
2002-06-30	17
2002-09-30	17.3
2002-12-31	16.7
2003-03-31	14.7
2003-06-30	13.7
2003-09-30	12.2
2003-12-31	11.6
2004-03-31	12.7
2004-06-30	12.8
2004-09-30	13.1
2004-12-31	13.1
2005-03-31	12.1
2005-06-30	11.7
2005-09-30	10.7
2005-12-31	10.3
2006-03-31	9.6
2006-06-30	8.6
2006-09-30	7.8
2006-12-31	6.4
2007-03-31	4.7
2007-06-30	4.1
2007-09-30	3.9
2007-12-31	3.2
2008-03-31	4
2008-06-30	3.1
2008-09-30	1.3
2008-12-31	0.6
2009-03-31	-2.1
2009-06-30	-3.9
2009-09-30	-4.8
2009-12-31	-3.5
2010-03-31	-3.2
2010-06-30	-2.6
2010-09-30	-2.7
2010-12-31	-3.5
2011-03-31	-3.1
2011-06-30	-2.4
2011-09-30	-2
2011-12-31	-3.1
2012-03-31	-3.6
2012-06-30	-4.2
2012-09-30	-4
2012-12-31	-2.9
2013-03-31	-0.9
2013-06-30	0.3
2013-09-30	2.8
2013-12-31	3.2
2014-03-31	3.8
2014-06-30	5.5
2014-09-30	5.7
2014-12-31	6.7
2015-03-31	7.4