Quarter	Percent
1978-03-31	6.4593
1978-06-30	8.6643
1978-09-30	9.6044
1978-12-31	11.1083
1979-03-31	12.7049
1979-06-30	12.3818
1979-09-30	14.1276
1979-12-31	15.4851
1980-03-31	17.7179
1980-06-30	17.3661
1980-09-30	16.6818
1980-12-31	15.7381
1981-03-31	13.8319
1981-06-30	12.1055
1981-09-30	13.7182
1981-12-31	15.5795
1982-03-31	14.3714
1982-06-30	13.2634
1982-09-30	11.6436
1982-12-31	10.1613
1983-03-31	11.3777
1983-06-30	10.3179
1983-09-30	9.7062
1983-12-31	9.2939
1984-03-31	9.2406
1984-06-30	8.9182
1984-09-30	11.2766
1984-12-31	10.2467
1985-03-31	13.2423
1985-06-30	12.813
1985-09-30	11.9502
1985-12-31	11.6488
1986-03-31	12.5316
1986-06-30	10.5203
1986-09-30	10.0148
1986-12-31	10.9443
1987-03-31	10.8312
1987-06-30	9.2103
1987-09-30	9.4669
1987-12-31	9.129
1988-03-31	8.6924
1988-06-30	8.0808
1988-09-30	10.8949
1988-12-31	12.2653
1989-03-31	12.981
1989-06-30	13.1724
1989-09-30	13.9111
1989-12-31	15.0399
1990-03-31	15.0643
1990-06-30	14.9826
1990-09-30	14.9607
1990-12-31	14.1584
1991-03-31	13.5636
1991-06-30	11.8376
1991-09-30	10.9298
1991-12-31	10.6355
1992-03-31	10.587
1992-06-30	10.1911
1992-09-30	10.0963
1992-12-31	7.8419
1993-03-31	6.4631
1993-06-30	5.9036
1993-09-30	5.9412
1993-12-31	5.6863
1994-03-31	5.2512
1994-06-30	5.0304
1994-09-30	5.1204
1994-12-31	5.6841
1995-03-31	6.3346
1995-06-30	6.337
1995-09-30	6.675
1995-12-31	6.6571
1996-03-31	6.2466
1996-06-30	5.933
1996-09-30	5.7491
1996-12-31	6.0121
1997-03-31	6.0931
1997-06-30	6.301
1997-09-30	6.968
1997-12-31	7.3144
1998-03-31	7.4162
1998-06-30	7.4201
1998-09-30	7.5107
1998-12-31	6.9414
1999-03-31	5.649
1999-06-30	5.2108
1999-09-30	5.0812
1999-12-31	5.4252
2000-03-31	5.9358
2000-06-30	6.027
2000-09-30	5.9986
2000-12-31	5.9435
2001-03-31	5.7151
2001-06-30	5.2408
2001-09-30	4.9425
2001-12-31	4.1248
2002-03-31	3.9657
2002-06-30	3.9675
2002-09-30	3.8856
2002-12-31	3.9085
2003-03-31	3.7479
2003-06-30	3.606
2003-09-30	3.4743
2003-12-31	3.7188
2004-03-31	3.9838
2004-06-30	4.333
2004-09-30	4.7123
2004-12-31	4.7652
2005-03-31	4.7808
2005-06-30	4.7894
2005-09-30	4.5796
2005-12-31	4.5411
2006-03-31	4.517
2006-06-30	4.5907
2006-09-30	4.767
2006-12-31	5.061
2007-03-31	5.3582
2007-06-30	5.5723
2007-09-30	6.1568
2007-12-31	6.1088
2008-03-31	5.5755
2008-06-30	5.4761
2008-09-30	5.4362
2008-12-31	4.1672
2009-03-31	1.4431
2009-06-30	0.7316
2009-09-30	0.5604
2009-12-31	0.5259
2010-03-31	0.5251
2010-06-30	0.5549
2010-09-30	0.575
2010-12-31	0.5955
2011-03-31	0.6258
2011-06-30	0.6349
2011-09-30	0.6804
2011-12-31	0.7646
2012-03-31	0.783
2012-06-30	0.6737
2012-09-30	0.5438
2012-12-31	0.477
2013-03-31	0.4636
2013-06-30	0.4581
2013-09-30	0.4659
2013-12-31	0.4843
2014-03-31	0.474
2014-06-30	0.4726
2014-09-30	0.4676
2014-12-31	0.4645
2015-03-31	0.4739
2015-06-30	0.4802
2015-09-30	0.505
2015-12-31	0.505
2016-03-31	0.4906
2016-06-30	0.4903
2016-09-30	0.3799
2016-12-31	0.3094
2017-03-31	0.2959
2017-06-30	0.28
2017-09-30	0.2844