Quarter	Percent
1987-03-31	7.06
1987-09-30	7.63
1987-12-31	7.03
1988-03-31	6.69
1988-06-30	7.7
1988-09-30	8.25
1988-12-31	9.08
1989-03-31	9.95
1989-06-30	9.33
1989-09-30	9.02
1989-12-31	8.39
1990-03-31	8.28
1990-06-30	8.2
1990-09-30	8.18
1990-12-31	7.53
1991-03-31	6.23
1991-06-30	5.96
1991-09-30	5.35
1991-12-31	4.21
1992-03-31	4.14
1992-06-30	3.85
1992-09-30	3.1
1992-12-31	3.21
1993-03-31	3.1
1993-06-30	3.09
1993-09-30	3.09
1993-12-31	3.16
1994-03-31	3.6
1994-06-30	4.47
1994-09-30	4.97
1994-12-31	5.9
1995-03-31	6.04
1995-06-30	6.03
1995-09-30	5.78
1995-12-31	5.6
1996-03-31	5.34
1996-06-30	5.4
1996-09-30	5.33
1996-12-31	5.42
1997-03-31	5.6
1997-06-30	5.56
1997-09-30	5.56
1997-12-31	5.61
1998-03-31	5.58
1998-06-30	5.57
1998-09-30	5.27
1998-12-31	4.98
1999-03-31	4.83
1999-06-30	5.12
1999-09-30	5.36
1999-12-31	5.75
2000-03-31	6.07
2000-06-30	6.58
2000-09-30	6.56
2000-12-31	6.5
2001-03-31	5.02
2001-06-30	3.82
2001-09-30	2.57
2001-12-31	1.81
2002-03-31	1.82
2002-06-30	1.78
2002-09-30	1.75
2002-12-31	1.32
2003-03-31	1.25
2003-06-30	1.06
2003-09-30	1.06
2003-12-31	1.06
2004-03-31	1.04
2004-06-30	1.31
2004-09-30	1.8
2004-12-31	2.33
2005-03-31	2.83
2005-06-30	3.32
2005-09-30	3.83
2005-12-31	4.36
2006-03-31	4.79
2006-06-30	5.31
2006-09-30	5.29
2006-12-31	5.3
2007-03-31	5.29
2007-06-30	5.3
2007-09-30	5.17
2007-12-31	4.61
2008-03-31	2.73
2008-06-30	2.52
2008-09-30	5.25
2008-12-31	0.45
2009-03-31	0.6
2009-06-30	0.31
2009-09-30	0.24
2009-12-31	0.23
2010-03-31	0.23
2010-06-30	0.42
2010-09-30	0.26
2010-12-31	0.33
2011-03-31	0.25
2011-06-30	0.18
2011-09-30	0.22
2011-12-31	0.29
2012-03-31	0.33
2012-06-30	0.24
2012-09-30	0.21
2012-12-31	0.21
2013-03-31	0.205