Quarter	Percent
1987-03-31	7.71
1987-06-30	7.61
1987-09-30	7.17
1987-12-31	7.68
1988-03-31	6.81
1988-06-30	7.32
1988-09-30	8.22
1988-12-31	8.85
1989-03-31	9.62
1989-06-30	9.65
1989-09-30	8.86
1989-12-31	8.56
1990-03-31	8.28
1990-06-30	8.31
1990-09-30	8.06
1990-12-31	8.03
1991-03-31	6.78
1991-06-30	6
1991-09-30	5.72
1991-12-31	5
1992-03-31	4.14
1992-06-30	3.9
1992-09-30	3.31
1992-12-31	3.48
1993-03-31	3.14
1993-06-30	3.12
1993-09-30	3.13
1993-12-31	3.26
1994-03-31	3.4
1994-06-30	4.25
1994-09-30	4.76
1994-12-31	5.68
1995-03-31	6.09
1995-06-30	6.01
1995-09-30	5.8
1995-12-31	5.77
1996-03-31	5.33
1996-06-30	5.38
1996-09-30	5.43
1996-12-31	5.4
1997-03-31	5.42
1997-06-30	5.65
1997-09-30	5.59
1997-12-31	5.71
1998-03-31	5.55
1998-06-30	5.58
1998-09-30	5.52
1998-12-31	5.22
1999-03-31	4.88
1999-06-30	4.92
1999-09-30	5.26
1999-12-31	5.88
2000-03-31	5.94
2000-06-30	6.48
2000-09-30	6.59
2000-12-31	6.62
2001-03-31	5.36
2001-06-30	4.16
2001-09-30	3.44
2001-12-31	2.11
2002-03-31	1.81
2002-06-30	1.82
2002-09-30	1.75
2002-12-31	1.5
2003-03-31	1.27
2003-06-30	1.19
2003-09-30	1.06
2003-12-31	1.1
2004-03-31	1.06
2004-06-30	1.18
2004-09-30	1.62
2004-12-31	2.18
2005-03-31	2.69
2005-06-30	3.15
2005-09-30	3.65
2005-12-31	4.22
2006-03-31	4.65
2006-06-30	5.13
2006-09-30	5.36
2006-12-31	5.32
2007-03-31	5.31
2007-06-30	5.31
2007-09-30	5.43
2007-12-31	5.03
2008-03-31	3.3
2008-06-30	2.74
2008-09-30	2.88
2008-12-31	2.81
2009-03-31	1
2009-06-30	0.68
2009-09-30	0.33
2009-12-31	0.24
2010-03-31	0.24
2010-06-30	0.38
2010-09-30	0.36
2010-12-31	0.29
2011-03-31	0.28
2011-06-30	0.2517
2011-09-30	0.2448
2011-12-31	0.3467
2012-03-31	0.4052
2012-06-30	0.3481
2012-09-30	0.323
2012-12-31	0.263
2013-03-31	0.2434