Quarter	Percent
1978-03-31	7.3543
1978-06-30	9.396
1978-09-30	9.8595
1978-12-31	11.6912
1979-03-31	12.4501
1979-06-30	11.9218
1979-09-30	13.622
1979-12-31	15.416
1980-03-31	17.0041
1980-06-30	16.211
1980-09-30	15.1852
1980-12-31	14.9439
1981-03-31	12.9119
1981-06-30	12.5827
1981-09-30	14.3591
1981-12-31	15.4927
1982-03-31	14.3607
1982-06-30	13.3775
1982-09-30	11.5028
1982-12-31	9.8404
1983-03-31	11.1465
1983-06-30	10.2594
1983-09-30	10.2471
1983-12-31	9.6449
1984-03-31	9.5145
1984-06-30	9.7332
1984-09-30	11.2901
1984-12-31	10.3023
1985-03-31	12.4322
1985-06-30	12.3328
1985-09-30	11.4702
1985-12-31	11.4835
1986-03-31	12.228
1986-06-30	9.8457
1986-09-30	9.9455
1986-12-31	11.2326
1987-03-31	10.4029
1987-06-30	9.1237
1987-09-30	9.9555
1987-12-31	9.3505
1988-03-31	9.1952
1988-06-30	8.7649
1988-09-30	11.4355
1988-12-31	12.4138
1989-03-31	12.9635
1989-06-30	13.5736
1989-09-30	13.8429
1989-12-31	14.9474
1990-03-31	15.2402
1990-06-30	15.2172
1990-09-30	14.8569
1990-12-31	13.373
1991-03-31	12.7338
1991-06-30	11.3035
1991-09-30	10.5977
1991-12-31	10.4485
1992-03-31	10.4875
1992-06-30	10.1885
1992-09-30	10.1653
1992-12-31	7.2502
1993-03-31	6.1174
1993-06-30	5.9605
1993-09-30	5.7916
1993-12-31	5.4284
1994-03-31	5.2327
1994-06-30	5.3929
1994-09-30	5.8865
1994-12-31	6.6188
1995-03-31	7.072
1995-06-30	6.9518
1995-09-30	6.8446
1995-12-31	6.565
1996-03-31	6.1354
1996-06-30	6.0145
1996-09-30	5.781
1996-12-31	6.3405
1997-03-31	6.4186
1997-06-30	6.6831
1997-09-30	7.2527
1997-12-31	7.5587
1998-03-31	7.476
1998-06-30	7.5137
1998-09-30	7.567
1998-12-31	6.5478
1999-03-31	5.3625
1999-06-30	5.1907
1999-09-30	5.5107
1999-12-31	6.0458
2000-03-31	6.3277
2000-06-30	6.3373
2000-09-30	6.24
2000-12-31	6.0213
2001-03-31	5.5298
2001-06-30	5.2135
2001-09-30	4.95
2001-12-31	4.095
2002-03-31	4.1535
2002-06-30	4.3161
2002-09-30	4.0086
2002-12-31	3.9303
2003-03-31	3.6853
2003-06-30	3.5091
2003-09-30	3.5528
2003-12-31	4.0205
2004-03-31	4.251
2004-06-30	4.7084
2004-09-30	4.9918
2004-12-31	4.8716
2005-03-31	4.9065
2005-06-30	4.8286
2005-09-30	4.5022
2005-12-31	4.5522
2006-03-31	4.5418
2006-06-30	4.7111
2006-09-30	4.9524
2006-12-31	5.2612
2007-03-31	5.6101
2007-06-30	5.8519
2007-09-30	6.3134
2007-12-31	6.1804
2008-03-31	5.6268
2008-06-30	5.9432
2008-09-30	5.9685
2008-12-31	4.7674
2009-03-31	2.2272
2009-06-30	1.5594
2009-09-30	1.0568
2009-12-31	0.8127
2010-03-31	0.8381
2010-06-30	0.9133
2010-09-30	1.02
2010-12-31	1.0344
2011-03-31	1.0646
2011-06-30	1.0958
2011-09-30	1.1738
2011-12-31	1.339
2012-03-31	1.3981
2012-06-30	1.3162
2012-09-30	1.0032
2012-12-31	0.7102
2013-03-31	0.6296
2013-06-30	0.5669
2013-09-30	0.5771
2013-12-31	0.5894
2014-03-31	0.5918
2014-06-30	0.6501
2014-09-30	0.6741
2014-12-31	0.6767
2015-03-31	0.6712
2015-06-30	0.6992
2015-09-30	0.79
2015-12-31	0.79
2016-03-31	0.79
2016-06-30	0.7891
2016-09-30	0.634
2016-12-31	0.5641
2017-03-31	0.5247
2017-06-30	0.492
2017-09-30	0.4916