Quarter	Percent
1976-06-30	11
1976-09-30	17.7
1976-12-31	10.1
1977-03-31	18.3
1977-06-30	23
1977-09-30	26.2
1977-12-31	25.3
1978-03-31	17.1
1978-06-30	20.6
1978-09-30	21
1978-12-31	20.2
1979-03-31	28.9
1979-06-30	26.9
1979-09-30	30.2
1979-12-31	34.2
1980-03-31	35.2
1980-06-30	36.2
1980-09-30	35.8
1980-12-31	29.5
1981-03-31	26.5
1981-06-30	25.9
1981-09-30	25
1981-12-31	26.1
1982-03-31	29.2
1982-06-30	27.4
1982-09-30	29.3
1982-12-31	25.7
1983-03-31	22
1983-06-30	21.5
1983-09-30	19.7
1983-12-31	20.3
1984-03-31	17.8
1984-06-30	13.9
1984-09-30	13
1984-12-31	10.9
1985-03-31	14.6
1985-06-30	16.8
1985-09-30	18
1985-12-31	21.9
1986-03-31	18.1
1986-06-30	20.7
1986-09-30	15
1986-12-31	12.9
1987-03-31	14.9
1987-06-30	10
1987-09-30	13.6
1987-12-31	18
1988-03-31	16.1
1988-06-30	23.7
1988-09-30	26.9
1988-12-31	27.4
1989-03-31	32.6
1989-06-30	28.5
1989-09-30	28.1
1989-12-31	26.3
1990-03-31	24.2
1990-06-30	19.5
1990-09-30	16.6
1990-12-31	13.7
1991-03-31	9.3
1991-06-30	8.8
1991-09-30	4.8
1991-12-31	2
1992-03-31	0.9
1992-06-30	0.5
1992-09-30	-0.4
1992-12-31	0.5
1993-03-31	-1.3
1993-06-30	-3.1
1993-09-30	-1.1
1993-12-31	-2.2
1994-03-31	-1.4
1994-06-30	0.1
1994-09-30	-0.3
1994-12-31	1.3
1995-03-31	3.3
1995-06-30	3.6
1995-09-30	4.7
1995-12-31	5.2
1996-03-31	5.1
1996-06-30	5.3
1996-09-30	5
1996-12-31	3.3
1997-03-31	4.8
1997-06-30	3.5
1997-09-30	2.4
1997-12-31	3.5
1998-03-31	3.8
1998-06-30	4.6
1998-09-30	5.8
1998-12-31	6.3
1999-03-31	7.2
1999-06-30	6.7
1999-09-30	8.4
1999-12-31	10.9
2000-03-31	12.3
2000-06-30	14.4
2000-09-30	16.1
2000-12-31	15.7
2001-03-31	13.9
2001-06-30	11.7
2001-09-30	10
2001-12-31	10.3
2002-03-31	9.9
2002-06-30	11.3
2002-09-30	12
2002-12-31	12.2
2003-03-31	11.6
2003-06-30	12
2003-09-30	11.5
2003-12-31	11.2
2004-03-31	11.2
2004-06-30	11.7
2004-09-30	12.8
2004-12-31	10.6
2005-03-31	12.5
2005-06-30	14.2
2005-09-30	13.6
2005-12-31	17.3
2006-03-31	17.6
2006-06-30	15.8
2006-09-30	16.3
2006-12-31	16.8
2007-03-31	14.7
2007-06-30	14.8
2007-09-30	14.7
2007-12-31	10.3
2008-03-31	10
2008-06-30	10.1
2008-09-30	7.9
2008-12-31	6.3
2009-03-31	2.8
2009-06-30	-1.2
2009-09-30	-3.2
2009-12-31	-2.3
2010-03-31	-2.1
2010-06-30	-2.2
2010-09-30	-2.8
2010-12-31	-3.6
2011-03-31	-3.7
2011-06-30	-3.7
2011-09-30	-2
2011-12-31	-2.2
2012-03-31	-3.6
2012-06-30	-4
2012-09-30	-5.4
2012-12-31	-5.1
2013-03-31	-3.8
2013-06-30	-4.5
2013-09-30	-4.6
2013-12-31	-6.1
2014-03-31	-6.2
2014-06-30	-5.5
2014-09-30	-4.4
2014-12-31	-3.3
2015-03-31	-3.5