Quarter	Percent
1987-03-31	8.47
1987-06-30	7.65
1987-09-30	7.56
1987-12-31	7.94
1988-03-31	7
1988-06-30	7.58
1988-09-30	8.56
1988-12-31	8.94
1989-03-31	9.91
1989-06-30	9.67
1989-09-30	8.72
1989-12-31	8.32
1990-03-31	8.37
1990-06-30	8.49
1990-09-30	8.09
1990-12-31	7.91
1991-03-31	6.81
1991-06-30	6.23
1991-09-30	5.95
1991-12-31	4.95
1992-03-31	4.25
1992-06-30	4.09
1992-09-30	3.43
1992-12-31	3.57
1993-03-31	3.3
1993-06-30	3.3
1993-09-30	3.35
1993-12-31	3.38
1994-03-31	3.7
1994-06-30	4.75
1994-09-30	5.26
1994-12-31	6.22
1995-03-31	6.51
1995-06-30	6.05
1995-09-30	5.79
1995-12-31	5.67
1996-03-31	5.24
1996-06-30	5.54
1996-09-30	5.7
1996-12-31	5.5
1997-03-31	5.59
1997-06-30	5.87
1997-09-30	5.73
1997-12-31	5.78
1998-03-31	5.57
1998-06-30	5.65
1998-09-30	5.52
1998-12-31	5
1999-03-31	4.95
1999-06-30	5.08
1999-09-30	5.71
1999-12-31	6.01
2000-03-31	6.26
2000-06-30	6.79
2000-09-30	6.78
2000-12-31	6.56
2001-03-31	5.12
2001-06-30	4.06
2001-09-30	3.41
2001-12-31	2.1
2002-03-31	2
2002-06-30	2.05
2002-09-30	1.76
2002-12-31	1.49
2003-03-31	1.27
2003-06-30	1.14
2003-09-30	1.11
2003-12-31	1.17
2004-03-31	1.13
2004-06-30	1.5
2004-09-30	1.93
2004-12-31	2.43
2005-03-31	3.03
2005-06-30	3.45
2005-09-30	3.93
2005-12-31	4.48
2006-03-31	4.87
2006-06-30	5.3
2006-09-30	5.46
2006-12-31	5.34
2007-03-31	5.33
2007-06-30	5.34
2007-09-30	5.36
2007-12-31	4.93
2008-03-31	3.18
2008-06-30	2.97
2008-09-30	3.25
2008-12-31	3.09
2009-03-31	1.76
2009-06-30	1.4
2009-09-30	0.84
2009-12-31	0.53
2010-03-31	0.39
2010-06-30	0.64
2010-09-30	0.63
2010-12-31	0.47
2011-03-31	0.47
2011-06-30	0.4372
2011-09-30	0.4508
2011-12-31	0.6741
2012-03-31	0.7869
2012-06-30	0.7309
2012-09-30	0.6648
2012-12-31	0.5442
2013-03-31	0.4654