Quarter	Percent
1978-03-31	6.5308
1978-06-30	8.9077
1978-09-30	9.5454
1978-12-31	11.5682
1979-03-31	12.532
1979-06-30	12.1801
1979-09-30	14.0393
1979-12-31	15.6509
1980-03-31	17.6016
1980-06-30	17.0587
1980-09-30	15.9601
1980-12-31	15.3728
1981-03-31	13.1734
1981-06-30	12.3709
1981-09-30	14.2235
1981-12-31	15.4734
1982-03-31	14.2001
1982-06-30	13.2423
1982-09-30	11.2378
1982-12-31	9.7966
1983-03-31	11.0432
1983-06-30	10.041
1983-09-30	9.7185
1983-12-31	9.2674
1984-03-31	9.1617
1984-06-30	9.1722
1984-09-30	11.0034
1984-12-31	10.0126
1985-03-31	12.888
1985-06-30	12.4247
1985-09-30	11.5178
1985-12-31	11.507
1986-03-31	12.328
1986-06-30	10.0389
1986-09-30	9.8692
1986-12-31	11.0881
1987-03-31	10.4781
1987-06-30	9.04
1987-09-30	9.6792
1987-12-31	9.1038
1988-03-31	8.8945
1988-06-30	8.2931
1988-09-30	11.1716
1988-12-31	12.3572
1989-03-31	12.986
1989-06-30	13.3821
1989-09-30	13.8731
1989-12-31	15.0175
1990-03-31	15.1209
1990-06-30	15.0416
1990-09-30	14.9024
1990-12-31	13.7338
1991-03-31	13.1447
1991-06-30	11.4814
1991-09-30	10.6722
1991-12-31	10.438
1992-03-31	10.4424
1992-06-30	10.1105
1992-09-30	10.0235
1992-12-31	7.4254
1993-03-31	6.2113
1993-06-30	5.8194
1993-09-30	5.7692
1993-12-31	5.4486
1994-03-31	5.1658
1994-06-30	5.0927
1994-09-30	5.3807
1994-12-31	6.0058
1995-03-31	6.5775
1995-06-30	6.6101
1995-09-30	6.7065
1995-12-31	6.5717
1996-03-31	6.1489
1996-06-30	5.9138
1996-09-30	5.7135
1996-12-31	6.1321
1997-03-31	6.1915
1997-06-30	6.4469
1997-09-30	7.0653
1997-12-31	7.4218
1998-03-31	7.4291
1998-06-30	7.4593
1998-09-30	7.5356
1998-12-31	6.7482
1999-03-31	5.4521
1999-06-30	5.1634
1999-09-30	5.1485
1999-12-31	5.8201
2000-03-31	6.0688
2000-06-30	6.1499
2000-09-30	6.0851
2000-12-31	5.9649
2001-03-31	5.6115
2001-06-30	5.2013
2001-09-30	4.9048
2001-12-31	4.0745
2002-03-31	3.9857
2002-06-30	4.0765
2002-09-30	3.9269
2002-12-31	3.8979
2003-03-31	3.7208
2003-06-30	3.5611
2003-09-30	3.4908
2003-12-31	3.8504
2004-03-31	4.1012
2004-06-30	4.5057
2004-09-30	4.8462
2004-12-31	4.8127
2005-03-31	4.8431
2005-06-30	4.8219
2005-09-30	4.5554
2005-12-31	4.5555
2006-03-31	4.5282
2006-06-30	4.641
2006-09-30	4.8527
2006-12-31	5.1664
2007-03-31	5.493
2007-06-30	5.8265
2007-09-30	6.3253
2007-12-31	6.2958
2008-03-31	5.6781
2008-06-30	5.8575
2008-09-30	5.8049
2008-12-31	4.6422
2009-03-31	2.0409
2009-06-30	1.2734
2009-09-30	0.7112
2009-12-31	0.55
2010-03-31	0.5845
2010-06-30	0.693
2010-09-30	0.755
2010-12-31	0.7383
2011-03-31	0.8274
2011-06-30	0.875
2011-09-30	0.9322
2011-12-31	1.1012
2012-03-31	1.1486
2012-06-30	1.076
2012-09-30	0.7666
2012-12-31	0.575
2013-03-31	0.5719
2013-06-30	0.5502
2013-09-30	0.525
2013-12-31	0.5492
2014-03-31	0.575
2014-06-30	0.575
2014-09-30	0.5723
2014-12-31	0.5523
2015-03-31	0.5508
2015-06-30	0.551
2015-09-30	0.55
2015-12-31	0.5594
2016-03-31	0.6484
2016-06-30	0.646
2016-09-30	0.4003
2016-12-31	0.3516
2017-03-31	0.3492
2017-06-30	0.35
2017-09-30	0.3098
2017-12-31	0.4238
2018-03-31	0.5238
2018-06-30	0.6806