Quarter	Percent
1987-03-31	7.68
1987-09-30	8.25
1987-12-31	7.28
1988-03-31	6.8
1988-06-30	7.82
1988-09-30	8.56
1988-12-31	9.2
1989-03-31	10.2
1989-06-30	9.19
1989-09-30	9.08
1989-12-31	8.26
1990-03-31	8.39
1990-06-30	8.27
1990-09-30	8.2
1990-12-31	7.46
1991-03-31	6.27
1991-06-30	6.09
1991-09-30	5.55
1991-12-31	4.16
1992-03-31	4.27
1992-06-30	3.85
1992-09-30	3.17
1992-12-31	3.34
1993-03-31	3.16
1993-06-30	3.22
1993-09-30	3.28
1993-12-31	3.29
1994-03-31	3.84
1994-06-30	4.78
1994-09-30	5.41
1994-12-31	6.41
1995-03-31	6.16
1995-06-30	5.96
1995-09-30	5.87
1995-12-31	5.54
1996-03-31	5.37
1996-06-30	5.5
1996-09-30	5.53
1996-12-31	5.47
1997-03-31	5.68
1997-06-30	5.68
1997-09-30	5.67
1997-12-31	5.7
1998-03-31	5.62
1998-06-30	5.62
1998-09-30	5.21
1998-12-31	4.98
1999-03-31	4.89
1999-06-30	5.25
1999-09-30	6
1999-12-31	5.92
2000-03-31	6.23
2000-06-30	6.72
2000-09-30	6.74
2000-12-31	6.34
2001-03-31	4.82
2001-06-30	3.8
2001-09-30	2.53
2001-12-31	1.81
2002-03-31	1.97
2002-06-30	1.8
2002-09-30	1.73
2002-12-31	1.32
2003-03-31	1.23
2003-06-30	1.06
2003-09-30	1.1
2003-12-31	1.1
2004-03-31	1.06
2004-06-30	1.57
2004-09-30	1.97
2004-12-31	2.51
2005-03-31	3.08
2005-06-30	3.49
2005-09-30	4.02
2005-12-31	4.5
2006-03-31	4.97
2006-06-30	5.45
2006-09-30	5.33
2006-12-31	5.31
2007-03-31	5.3
2007-06-30	5.33
2007-09-30	5.28
2007-12-31	4.71
2008-03-31	2.72
2008-06-30	2.83
2008-09-30	4.5
2008-12-31	1.5
2009-03-31	1.2
2009-06-30	0.6
2009-09-30	0.3
2009-12-31	0.25
2010-03-31	0.29
2010-06-30	0.59
2010-09-30	0.3
2010-12-31	0.37
2011-03-31	0.31
2011-06-30	0.25
2011-09-30	0.37
2011-12-31	0.58
2012-03-31	0.53
2012-06-30	0.46
2012-09-30	0.36
2012-12-31	0.31
2013-03-31	0.285