Quarter	Percent
1978-03-31	8.285
1978-06-30	10.535
1978-09-30	10.19
1978-12-31	12.285
1979-03-31	11.095
1979-06-30	12.72
1979-09-30	13.19
1979-12-31	15.22
1980-03-31	17.38
1980-06-30	14.375
1980-09-30	14.25
1980-12-31	14.095
1981-03-31	12.315
1981-06-30	13.22
1981-09-30	16.345
1981-12-31	15.405
1982-03-31	13.625
1982-06-30	13.19
1982-09-30	10.565
1982-12-31	10.44
1983-03-31	10.81
1983-06-30	10.255
1983-09-30	9.94
1983-12-31	10
1984-03-31	9.5
1984-06-30	10.755
1984-09-30	10.94
1984-12-31	10.44
1985-03-31	11.94
1985-06-30	12.065
1985-09-30	11
1985-12-31	11.69
1986-03-31	10.44
1986-06-30	9.66
1986-09-30	11.375
1986-12-31	11.125
1987-03-31	9.625
1987-06-30	9.44
1987-09-30	10.565
1987-12-31	9.315
1988-03-31	9.125
1988-06-30	10.19
1988-09-30	11.815
1988-12-31	12.875
1989-03-31	12.91
1989-06-30	14.125
1989-09-30	14.375
1989-12-31	14.66
1990-03-31	15.53
1990-06-30	14.625
1990-09-30	14.5
1990-12-31	12.845
1991-03-31	11.565
1991-06-30	10.875
1991-09-30	10.095
1991-12-31	10.91
1992-03-31	11
1992-06-30	10.015
1992-09-30	8.47
1992-12-31	6.78
1993-03-31	5.845
1993-06-30	5.925
1993-09-30	5.72
1993-12-31	5.13
1994-03-31	5.735
1994-06-30	6.145
1994-09-30	7.395
1994-12-31	7.91
1995-03-31	7.53
1995-06-30	7.485
1995-09-30	6.795
1995-12-31	6.295
1996-03-31	6.375
1996-06-30	6.045
1996-09-30	6.19
1996-12-31	6.94
1997-03-31	6.925
1997-06-30	7.235
1997-09-30	7.5156
1997-12-31	7.61
1998-03-31	7.5156
1998-06-30	7.9531
1998-09-30	6.86
1998-12-31	5.515
1999-03-31	5.16
1999-06-30	5.41
1999-09-30	6.265
1999-12-31	6.625
2000-03-31	6.7344
2000-06-30	6.4376
2000-09-30	6.2188
2000-12-31	5.7188
2001-03-31	5.1876
2001-06-30	5.6407
2001-09-30	4.4532
2001-12-31	4.4063
2002-03-31	4.7813
2002-06-30	4.6094
2002-09-30	3.8906
2002-12-31	3.925
2003-03-31	3.515
2003-06-30	3.51
2003-09-30	3.97
2003-12-31	4.375
2004-03-31	4.7
2004-06-30	5.225
2004-09-30	5.03
2004-12-31	4.87
2005-03-31	5.05
2005-06-30	4.52
2005-09-30	4.47
2005-12-31	4.5
2006-03-31	4.725
2006-06-30	4.945
2006-09-30	5.235
2006-12-31	5.54
2007-03-31	5.82
2007-06-30	6.27
2007-09-30	6.14
2007-12-31	5.66
2008-03-31	5.795
2008-06-30	6.405
2008-09-30	6.425
2008-12-31	3.1
2009-03-31	2.05
2009-06-30	1.75
2009-09-30	1.15
2009-12-31	1.375
2010-03-31	1.305
2010-06-30	1.475
2010-09-30	1.475
2010-12-31	1.5
2011-03-31	1.575
2011-06-30	1.575
2011-09-30	1.77
2011-12-31	1.885
2012-03-31	1.89
2012-06-30	1.72
2012-09-30	1.31
2012-12-31	1.01
2013-03-31	0.87
2013-06-30	0.85
2013-09-30	0.865
2013-12-31	0.825
2014-03-31	0.87
2014-06-30	0.975
2014-09-30	1.085
2014-12-31	1.035
2015-03-31	1.05
2015-06-30	1.05
2015-09-30	1.065
2015-12-31	1.06
2016-03-31	1.015
2016-06-30	0.95
2016-09-30	0.74
2016-12-31	0.78
2017-03-31	0.69
2017-06-30	0.665
2017-09-30	0.705