Quarter	Percent
1987-12-31	23.2
1988-03-31	23.4
1988-06-30	29.1
1988-09-30	26.5
1988-12-31	27.8
1989-03-31	21
1989-06-30	17.5
1989-09-30	16.9
1989-12-31	14.9
1990-03-31	12.5
1990-06-30	2.4
1990-09-30	-3.1
1990-12-31	-7.8
1991-03-31	-7.1
1991-06-30	-6.2
1991-09-30	-5.2
1991-12-31	-4
1992-03-31	-9.6
1992-06-30	-9.3
1992-09-30	-10.7
1992-12-31	-14.9
1993-03-31	-10.5
1993-06-30	-12.8
1993-09-30	-10.6
1993-12-31	-8.3
1994-03-31	-6.3
1994-06-30	-3.5
1994-09-30	-3.9
1994-12-31	0.1
1995-03-31	-0.4
1995-06-30	0.9
1995-09-30	-2.4
1995-12-31	-1.4
1996-03-31	0.7
1996-06-30	5.8
1996-09-30	15.1
1996-12-31	11
1997-03-31	18
1997-06-30	6.5
1997-09-30	-5.3
1997-12-31	-5.6
1998-03-31	-8.2
1998-06-30	-7.8
1998-09-30	-1.8
1998-12-31	-0.6
1999-03-31	-3.5
1999-06-30	4.5
1999-09-30	8.4
1999-12-31	8.9
2000-03-31	11
2000-06-30	6.9
2000-09-30	6.1
2000-12-31	8.2
2001-03-31	14.3
2001-06-30	13.3
2001-09-30	10.5
2001-12-31	8.8
2002-03-31	3.9
2002-06-30	13.6
2002-09-30	12.2
2002-12-31	10.3
2003-03-31	4.4
2003-06-30	-0.1
2003-09-30	5
2003-12-31	7.8
2004-03-31	12.2
2004-06-30	4.8
2004-09-30	4.9
2004-12-31	6.1
2005-03-31	-0.6
2005-06-30	3.3
2005-09-30	-1.7
2005-12-31	-5.3
2006-03-31	1.6
2006-06-30	2.6
2006-09-30	2.4
2006-12-31	0
2007-03-31	-2.1
2007-06-30	3.2
2007-09-30	-0.9
2007-12-31	-3.9
2008-03-31	-4.7
2008-06-30	-14.9
2008-09-30	-8.1
2008-12-31	-7.9
2009-03-31	-16.6
2009-06-30	-10.6
2009-09-30	-15.5
2009-12-31	-11.5