Quarter	Percent
1987-03-31	8.34
1987-06-30	7.61
1987-09-30	7.24
1987-12-31	7.87
1988-03-31	6.86
1988-06-30	7.38
1988-09-30	8.3
1988-12-31	8.91
1989-03-31	9.7
1989-06-30	9.66
1989-09-30	8.81
1989-12-31	8.51
1990-03-31	8.3
1990-06-30	8.36
1990-09-30	8.06
1990-12-31	7.99
1991-03-31	6.79
1991-06-30	6.06
1991-09-30	5.75
1991-12-31	4.97
1992-03-31	4.15
1992-06-30	3.94
1992-09-30	3.32
1992-12-31	3.52
1993-03-31	3.18
1993-06-30	3.18
1993-09-30	3.16
1993-12-31	3.32
1994-03-31	3.49
1994-06-30	4.39
1994-09-30	4.88
1994-12-31	5.86
1995-03-31	6.2
1995-06-30	6.03
1995-09-30	5.8
1995-12-31	5.77
1996-03-31	5.31
1996-06-30	5.42
1996-09-30	5.5
1996-12-31	5.44
1997-03-31	5.47
1997-06-30	5.71
1997-09-30	5.63
1997-12-31	5.73
1998-03-31	5.56
1998-06-30	5.59
1998-09-30	5.52
1998-12-31	5.18
1999-03-31	4.9
1999-06-30	4.97
1999-09-30	5.35
1999-12-31	6.07
2000-03-31	6.05
2000-06-30	6.58
2000-09-30	6.64
2000-12-31	6.64
2001-03-31	5.28
2001-06-30	4.11
2001-09-30	3.4
2001-12-31	2.1
2002-03-31	1.84
2002-06-30	1.86
2002-09-30	1.75
2002-12-31	1.5
2003-03-31	1.27
2003-06-30	1.18
2003-09-30	1.07
2003-12-31	1.12
2004-03-31	1.07
2004-06-30	1.26
2004-09-30	1.7
2004-12-31	2.25
2005-03-31	2.79
2005-06-30	3.24
2005-09-30	3.73
2005-12-31	4.29
2006-03-31	4.73
2006-06-30	5.19
2006-09-30	5.4
2006-12-31	5.33
2007-03-31	5.32
2007-06-30	5.33
2007-09-30	5.43
2007-12-31	5.06
2008-03-31	3.3
2008-06-30	2.81
2008-09-30	2.99
2008-12-31	2.94
2009-03-31	1.3
2009-06-30	0.88
2009-09-30	0.43
2009-12-31	0.29
2010-03-31	0.26
2010-06-30	0.44
2010-09-30	0.44
2010-12-31	0.31
2011-03-31	0.31
2011-06-30	0.2873
2011-09-30	0.2949
2011-12-31	0.4804
2012-03-31	0.5405
2012-06-30	0.4687
2012-09-30	0.4197
2012-12-31	0.3177
2013-03-31	0.2929