Quarter	Percent
1975-03-31	9.3694
1975-06-30	9.4826
1975-09-30	10.4835
1975-12-31	10.7708
1976-03-31	8.4177
1976-06-30	10.9919
1976-09-30	12.3748
1976-12-31	13.5094
1977-03-31	8.7643
1977-06-30	7.4502
1977-09-30	5.3013
1977-12-31	6.2931
1978-03-31	5.9962
1978-06-30	9.2726
1978-09-30	9.1659
1978-12-31	11.5635
1979-03-31	11.4397
1979-06-30	13.3295
1979-09-30	13.3638
1979-12-31	15.8421
1980-03-31	16.2838
1980-06-30	15.6801
1980-09-30	14.3317
1980-12-31	13.0161
1981-03-31	11.5305
1981-06-30	11.878
1981-09-30	15.1231
1981-12-31	14.6701
1982-03-31	12.4717
1982-06-30	12.2313
1982-09-30	9.499
1982-12-31	9.7204
1983-03-31	10.2175
1983-06-30	9.2647
1983-09-30	8.968
1983-12-31	8.8391
1984-03-31	8.3829
1984-06-30	8.8638
1984-09-30	9.9807
1984-12-31	9.1225
1985-03-31	12.3571
1985-06-30	11.9659
1985-09-30	11.0069
1985-12-31	11.1662
1986-03-31	10.7444
1986-06-30	9.3029
1986-09-30	9.6865
1986-12-31	10.6646
1987-03-31	9.3157
1987-06-30	8.7617
1987-09-30	9.7727
1987-12-31	8.209
1988-03-31	8.0952
1988-06-30	9.7074
1988-09-30	11.3908
1988-12-31	12.5083
1989-03-31	12.394
1989-06-30	13.6226
1989-09-30	13.4431
1989-12-31	14.479
1990-03-31	14.587
1990-06-30	14.3198
1990-09-30	14.2333
1990-12-31	13.0581
1991-03-31	11.5556
1991-06-30	10.7456
1991-09-30	9.6979
1991-12-31	10.1879
1992-03-31	10.2134
1992-06-30	9.4619
1992-09-30	8.2261
1992-12-31	6.3574
1993-03-31	5.3346
1993-06-30	5.1541
1993-09-30	5.2048
1993-12-31	4.8934
1994-03-31	4.929
1994-06-30	4.9525
1994-09-30	5.471
1994-12-31	5.9162
1995-03-31	6.1134
1995-06-30	6.6197
1995-09-30	6.5378
1995-12-31	6.2159
1996-03-31	5.7999
1996-06-30	5.5318
1996-09-30	5.5516
1996-12-31	6.1647
1997-03-31	6.0361
1997-06-30	6.42
1997-09-30	6.8969
1997-12-31	7.1058
1998-03-31	7.0934
1998-06-30	7.3602
1998-09-30	6.7547
1998-12-31	5.5552
1999-03-31	4.8669
1999-06-30	4.7086
1999-09-30	5.3095
1999-12-31	5.6154
2000-03-31	5.8425
2000-06-30	5.846
2000-09-30	5.765
2000-12-31	5.6113
2001-03-31	5.2231
2001-06-30	5.036
2001-09-30	4.2828
2001-12-31	3.8333
2002-03-31	4.0002
2002-06-30	3.9311
2002-09-30	3.7742
2002-12-31	3.8427
2003-03-31	3.4814
2003-06-30	3.468
2003-09-30	3.5591
2003-12-31	3.739
2004-03-31	4.171
2004-06-30	4.619
2004-09-30	4.6795
2004-12-31	4.691
2005-03-31	4.7594
2005-06-30	4.5179
2005-09-30	4.4004
2005-12-31	4.4271
2006-03-31	4.4107
2006-06-30	4.5352
2006-09-30	4.8669
2006-12-31	5.108
2007-03-31	5.3808
2007-06-30	5.7699
2007-09-30	5.6055
2007-12-31	5.2388
2008-03-31	4.769
2008-06-30	5.1022
2008-09-30	4.5131
2008-12-31	1.242
2009-03-31	0.621
2009-06-30	0.4941
2009-09-30	0.387
2009-12-31	0.4911
2010-03-31	0.5131
2010-06-30	0.4877
2010-09-30	0.5106
2010-12-31	0.5007
2011-03-31	0.6043
2011-06-30	0.5083
2011-09-30	0.464
2011-12-31	0.2407
2012-03-31	0.4428
2012-06-30	0.3532
2012-09-30	0.261
2012-12-31	0.309
2013-03-31	0.3752
2013-06-30	0.3289
2013-09-30	0.3504
2013-12-31	0.257
2014-03-31	0.421
2014-06-30	0.4171
2014-09-30	0.4803
2014-12-31	0.3884
2015-03-31	0.4417
2015-06-30	0.4956
2015-09-30	0.4665
2015-12-31	0.4511
2016-03-31	0.4596
2016-06-30	0.3998
2016-09-30	0.1837
2016-12-31	0.0106
2017-03-31	0.0621
2017-06-30	0.1262