Quarter	Percent
1987-03-31	7.69
1987-09-30	8.4
1987-12-31	7.4
1988-03-31	7.03
1988-06-30	7.9
1988-09-30	8.68
1988-12-31	9.33
1989-03-31	10.58
1989-06-30	9.01
1989-09-30	9.02
1989-12-31	8.2
1990-03-31	8.59
1990-06-30	8.28
1990-09-30	8.2
1990-12-31	7.46
1991-03-31	6.39
1991-06-30	6.45
1991-09-30	5.55
1991-12-31	4.13
1992-03-31	4.42
1992-06-30	3.97
1992-09-30	3.17
1992-12-31	3.54
1993-03-31	3.29
1993-06-30	3.41
1993-09-30	3.29
1993-12-31	3.41
1994-03-31	4.15
1994-06-30	5.15
1994-09-30	5.65
1994-12-31	6.91
1995-03-31	6.4
1995-06-30	5.87
1995-09-30	5.84
1995-12-31	5.44
1996-03-31	5.4
1996-06-30	5.69
1996-09-30	5.62
1996-12-31	5.5
1997-03-31	5.84
1997-06-30	5.8
1997-09-30	5.73
1997-12-31	5.74
1998-03-31	5.65
1998-06-30	5.69
1998-09-30	5.14
1998-12-31	4.98
1999-03-31	4.95
1999-06-30	5.4
1999-09-30	5.91
1999-12-31	6.05
2000-03-31	6.46
2000-06-30	6.95
2000-09-30	6.7
2000-12-31	6.14
2001-03-31	4.65
2001-06-30	3.85
2001-09-30	2.47
2001-12-31	1.92
2002-03-31	2.27
2002-06-30	1.89
2002-09-30	1.65
2002-12-31	1.32
2003-03-31	1.18
2003-06-30	1.06
2003-09-30	1.12
2003-12-31	1.17
2004-03-31	1.1
2004-06-30	1.9
2004-09-30	2.14
2004-12-31	2.73
2005-03-31	3.35
2005-06-30	3.67
2005-09-30	4.19
2005-12-31	4.66
2006-03-31	5.1
2006-06-30	5.55
2006-09-30	5.33
2006-12-31	5.32
2007-03-31	5.3
2007-06-30	5.35
2007-09-30	5.19
2007-12-31	4.66
2008-03-31	2.67
2008-06-30	3.17
2008-09-30	4.8
2008-12-31	1.78
2009-03-31	1.75
2009-06-30	1.11
2009-09-30	0.58
2009-12-31	0.43
2010-03-31	0.45
2010-06-30	0.8
2010-09-30	0.5
2010-12-31	0.56
2011-03-31	0.46
2011-06-30	0.4
2011-09-30	0.555
2011-12-31	0.81
2012-03-31	0.75
2012-06-30	0.72
2012-09-30	0.64
2012-12-31	0.51
2013-03-31	0.405