Quarter	Percent
1978-03-31	6.3743
1978-06-30	8.2887
1978-09-30	9.5558
1978-12-31	10.7
1979-03-31	12.535
1979-06-30	12.3276
1979-09-30	13.9755
1979-12-31	15.0066
1980-03-31	17.5841
1980-06-30	17.2826
1980-09-30	16.8778
1980-12-31	15.787
1981-03-31	14.0328
1981-06-30	11.6238
1981-09-30	13.0425
1981-12-31	15.4766
1982-03-31	14.3626
1982-06-30	13.0683
1982-09-30	11.798
1982-12-31	10.1896
1983-03-31	11.362
1983-06-30	10.3754
1983-09-30	9.6108
1983-12-31	9.2403
1984-03-31	9.2255
1984-06-30	8.5357
1984-09-30	11.2752
1984-12-31	10.2095
1985-03-31	13.2698
1985-06-30	12.8661
1985-09-30	12.0598
1985-12-31	11.6393
1986-03-31	12.3593
1986-06-30	10.7246
1986-09-30	9.9348
1986-12-31	10.5984
1987-03-31	10.9835
1987-06-30	9.2598
1987-09-30	9.2494
1987-12-31	9.1069
1988-03-31	8.3887
1988-06-30	7.6407
1988-09-30	10.2992
1988-12-31	12.1328
1989-03-31	12.8159
1989-06-30	12.585
1989-09-30	13.8616
1989-12-31	14.9197
1990-03-31	14.925
1990-06-30	14.8737
1990-09-30	14.925
1990-12-31	14.2686
1991-03-31	13.7406
1991-06-30	11.9396
1991-09-30	10.9726
1991-12-31	10.6084
1992-03-31	10.5593
1992-06-30	10.0552
1992-09-30	9.9443
1992-12-31	7.9532
1993-03-31	6.3464
1993-06-30	5.8002
1993-09-30	5.9239
1993-12-31	5.719
1994-03-31	5.202
1994-06-30	4.8682
1994-09-30	4.8968
1994-12-31	5.3844
1995-03-31	6.0113
1995-06-30	6.02
1995-09-30	6.598
1995-12-31	6.6787
1996-03-31	6.2482
1996-06-30	5.8934
1996-09-30	5.7299
1996-12-31	5.8722
1997-03-31	5.9816
1997-06-30	6.1829
1997-09-30	6.8655
1997-12-31	7.1953
1998-03-31	7.3403
1998-06-30	7.2859
1998-09-30	7.433
1998-12-31	6.9459
1999-03-31	5.7051
1999-06-30	5.1789
1999-09-30	4.9874
1999-12-31	5.152
2000-03-31	5.7784
2000-06-30	5.9382
2000-09-30	5.9346
2000-12-31	5.9017
2001-03-31	5.731
2001-06-30	5.1738
2001-09-30	4.928
2001-12-31	4.1737
2002-03-31	3.9176
2002-06-30	3.7769
2002-09-30	3.8332
2002-12-31	3.9229
2003-03-31	3.7351
2003-06-30	3.6263
2003-09-30	3.4327
2003-12-31	3.6077
2004-03-31	3.8853
2004-06-30	4.2188
2004-09-30	4.6355
2004-12-31	4.7383
2005-03-31	4.7434
2005-06-30	4.7607
2005-09-30	4.5991
2005-12-31	4.526
2006-03-31	4.4991
2006-06-30	4.5531
2006-09-30	4.729
2006-12-31	4.9882
2007-03-31	5.2982
2007-06-30	5.485
2007-09-30	5.9325
2007-12-31	5.7838
2008-03-31	5.4236
2008-06-30	5.1066
2008-09-30	5.1294
2008-12-31	3.4359
2009-03-31	1.119
2009-06-30	0.5426
2009-09-30	0.5218
2009-12-31	0.4974
2010-03-31	0.4834
2010-06-30	0.5192
2010-09-30	0.535
2010-12-31	0.5539
2011-03-31	0.5685
2011-06-30	0.5755
2011-09-30	0.5942
2011-12-31	0.6651
2012-03-31	0.6355
2012-06-30	0.5743
2012-09-30	0.5112
2012-12-31	0.4742
2013-03-31	0.4753
2013-06-30	0.475
2013-09-30	0.475
2013-12-31	0.475
2014-03-31	0.475
2014-06-30	0.4742
2014-09-30	0.4746
2014-12-31	0.4504
2015-03-31	0.45
2015-06-30	0.4504
2015-09-30	0.4496
2015-12-31	0.4492
2016-03-31	0.45
2016-06-30	0.471
2016-09-30	0.3472
2016-12-31	0.2399
2017-03-31	0.2373
2017-06-30	0.2293
2017-09-30	0.2345