Quarter	Percent
1986-12-31	24.9
1987-03-31	12.8
1987-06-30	16.9
1987-09-30	17.9
1987-12-31	16.8
1988-03-31	17.2
1988-06-30	21.3
1988-09-30	25.7
1988-12-31	15.1
1989-03-31	13.3
1989-06-30	14.8
1989-09-30	14.8
1989-12-31	13.2
1990-03-31	22.3
1990-06-30	10.9
1990-09-30	10.4
1990-12-31	9.6
1991-03-31	8
1991-06-30	3.5
1991-09-30	6.5
1991-12-31	4.8
1992-03-31	4.5
1992-06-30	4.5
1992-09-30	4.7
1992-12-31	2.3
1993-03-31	1.7
1993-06-30	2.8
1993-09-30	4.3
1993-12-31	1.9
1994-03-31	3
1994-06-30	2.8
1994-09-30	5.5
1994-12-31	5.8
1995-03-31	8.7
1995-06-30	5.7
1995-09-30	7.1
1995-12-31	8.8
1996-03-31	8.5
1996-06-30	8.2
1996-09-30	7.3
1996-12-31	7.6
1997-03-31	5.1
1997-06-30	7.8
1997-09-30	4.6
1997-12-31	5.7
1998-03-31	7.2
1998-06-30	6.9
1998-09-30	7.2
1998-12-31	6.9
1999-03-31	6.7
1999-06-30	6.8
1999-09-30	8.4
1999-12-31	9.2
2000-03-31	11.6
2000-06-30	11.6
2000-09-30	9.5
2000-12-31	4
2001-03-31	8.4
2001-06-30	9.6
2001-09-30	8.7
2001-12-31	7.8
2002-03-31	7.9
2002-06-30	9
2002-09-30	12.7
2002-12-31	13.2
2003-03-31	6.4
2003-06-30	12
2003-09-30	11.3
2003-12-31	11.9
2004-03-31	8.2
2004-06-30	10.1
2004-09-30	12.5
2004-12-31	7.7
2005-03-31	7.6
2005-06-30	11.2
2005-09-30	11.9
2005-12-31	8.4
2006-03-31	4.9
2006-06-30	12.7
2006-09-30	14.4
2006-12-31	8.2
2007-03-31	7.5
2007-06-30	7
2007-09-30	11.2
2007-12-31	4.5
2008-03-31	9
2008-06-30	5.2
2008-09-30	-5
2008-12-31	-12.9
2009-03-31	2.5
2009-06-30	-0.1
2009-09-30	-0.7
2009-12-31	3.2
2010-03-31	-0.5
2010-06-30	-0.5
2010-09-30	0
2010-12-31	0
2011-03-31	0.1
2011-06-30	0.5
2011-09-30	-0.2
2011-12-31	-1.3
2012-03-31	0.3
2012-06-30	-0.8
2012-09-30	0.2
2012-12-31	-0.5
2013-03-31	0.5
2013-06-30	-1.1
2013-09-30	2.2
2013-12-31	1.8
2014-03-31	0.9
2014-06-30	1.9
2014-09-30	2.5
2014-12-31	0.9
2015-03-31	1.8