Quarter	Percent
1987-09-30	18.1
1987-12-31	16.1
1988-03-31	17.2
1988-06-30	18.3
1988-09-30	20.2
1988-12-31	19.8
1989-03-31	18.7
1989-06-30	17.1
1989-09-30	14.5
1989-12-31	14
1990-03-31	16.2
1990-06-30	15.2
1990-09-30	14.1
1990-12-31	13.2
1991-03-31	9.7
1991-06-30	7.8
1991-09-30	6.8
1991-12-31	5.7
1992-03-31	4.8
1992-06-30	5.1
1992-09-30	4.6
1992-12-31	4
1993-03-31	3.3
1993-06-30	2.9
1993-09-30	2.8
1993-12-31	2.7
1994-03-31	3
1994-06-30	3
1994-09-30	3.3
1994-12-31	4.3
1995-03-31	5.7
1995-06-30	6.4
1995-09-30	6.8
1995-12-31	7.6
1996-03-31	7.5
1996-06-30	8.1
1996-09-30	8.2
1996-12-31	7.9
1997-03-31	7
1997-06-30	6.9
1997-09-30	6.3
1997-12-31	5.8
1998-03-31	6.3
1998-06-30	6.1
1998-09-30	6.7
1998-12-31	7
1999-03-31	6.9
1999-06-30	6.9
1999-09-30	7.2
1999-12-31	7.8
2000-03-31	9
2000-06-30	10.2
2000-09-30	10.5
2000-12-31	9.1
2001-03-31	8.4
2001-06-30	7.9
2001-09-30	7.7
2001-12-31	8.6
2002-03-31	8.5
2002-06-30	8.4
2002-09-30	9.3
2002-12-31	10.7
2003-03-31	10.3
2003-06-30	11.1
2003-09-30	10.7
2003-12-31	10.4
2004-03-31	10.8
2004-06-30	10.4
2004-09-30	10.6
2004-12-31	9.6
2005-03-31	9.4
2005-06-30	9.7
2005-09-30	9.6
2005-12-31	9.7
2006-03-31	9.1
2006-06-30	9.4
2006-09-30	10
2006-12-31	10
2007-03-31	10.7
2007-06-30	9.2
2007-09-30	8.5
2007-12-31	7.5
2008-03-31	7.9
2008-06-30	7.4
2008-09-30	3.3
2008-12-31	-1.3
2009-03-31	-2.8
2009-06-30	-4.1
2009-09-30	-3
2009-12-31	1.2
2010-03-31	0.5
2010-06-30	0.4
2010-09-30	0.5
2010-12-31	-0.2
2011-03-31	-0.1
2011-06-30	0.2
2011-09-30	0.1
2011-12-31	-0.2
2012-03-31	-0.2
2012-06-30	-0.5
2012-09-30	-0.4
2012-12-31	-0.2
2013-03-31	-0.2
2013-06-30	-0.3
2013-09-30	0.3
2013-12-31	0.8
2014-03-31	0.9
2014-06-30	1.7
2014-09-30	1.8
2014-12-31	1.5
2015-03-31	1.8