Quarter	Percent
1978-03-31	8.0617
1978-06-30	9.6881
1978-09-30	10.0644
1978-12-31	11.5529
1979-03-31	12.1937
1979-06-30	11.6102
1979-09-30	12.8097
1979-12-31	14.593
1980-03-31	16.0436
1980-06-30	15.1271
1980-09-30	14.1203
1980-12-31	14.1958
1981-03-31	12.7544
1981-06-30	12.7083
1981-09-30	14.3705
1981-12-31	15.2904
1982-03-31	14.346
1982-06-30	13.4143
1982-09-30	11.5317
1982-12-31	9.8385
1983-03-31	11.0608
1983-06-30	10.3322
1983-09-30	10.5481
1983-12-31	9.9555
1984-03-31	9.7959
1984-06-30	10.1673
1984-09-30	11.3663
1984-12-31	10.434
1985-03-31	12.1371
1985-06-30	12.0467
1985-09-30	11.282
1985-12-31	11.3258
1986-03-31	12.0466
1986-06-30	9.6466
1986-09-30	9.9593
1986-12-31	11.2239
1987-03-31	10.3491
1987-06-30	9.2017
1987-09-30	10.1639
1987-12-31	9.5152
1988-03-31	9.4944
1988-06-30	9.2181
1988-09-30	11.4636
1988-12-31	12.2661
1989-03-31	12.7631
1989-06-30	13.481
1989-09-30	13.5985
1989-12-31	14.6071
1990-03-31	15.2317
1990-06-30	15.2547
1990-09-30	14.5286
1990-12-31	12.8656
1991-03-31	12.2694
1991-06-30	11.1291
1991-09-30	10.5421
1991-12-31	10.4146
1992-03-31	10.4318
1992-06-30	10.1551
1992-09-30	10.1159
1992-12-31	7.0347
1993-03-31	5.9817
1993-06-30	6.0427
1993-09-30	5.7205
1993-12-31	5.373
1994-03-31	5.28
1994-06-30	5.898
1994-09-30	6.6903
1994-12-31	7.409
1995-03-31	7.7687
1995-06-30	7.3829
1995-09-30	7.003
1995-12-31	6.5519
1996-03-31	6.1977
1996-06-30	6.2906
1996-09-30	6.0268
1996-12-31	6.6533
1997-03-31	6.7269
1997-06-30	6.9784
1997-09-30	7.4464
1997-12-31	7.6407
1998-03-31	7.469
1998-06-30	7.5238
1998-09-30	7.4882
1998-12-31	6.2436
1999-03-31	5.2948
1999-06-30	5.3163
1999-09-30	5.7984
1999-12-31	6.4064
2000-03-31	6.7036
2000-06-30	6.5978
2000-09-30	6.3956
2000-12-31	6.0573
2001-03-31	5.4688
2001-06-30	5.28
2001-09-30	5.0825
2001-12-31	4.2288
2002-03-31	4.5708
2002-06-30	4.729
2002-09-30	4.1793
2002-12-31	4.0234
2003-03-31	3.6689
2003-06-30	3.4911
2003-09-30	3.7235
2003-12-31	4.3439
2004-03-31	4.478
2004-06-30	5.0089
2004-09-30	5.1712
2004-12-31	4.9288
2005-03-31	4.9856
2005-06-30	4.8119
2005-09-30	4.4635
2005-12-31	4.5863
2006-03-31	4.6027
2006-06-30	4.8744
2006-09-30	5.1168
2006-12-31	5.3839
2007-03-31	5.7434
2007-06-30	6.03
2007-09-30	6.3426
2007-12-31	5.9744
2008-03-31	5.4669
2008-06-30	6.0202
2008-09-30	6.1258
2008-12-31	4.8004
2009-03-31	2.3736
2009-06-30	1.8891
2009-09-30	1.4348
2009-12-31	1.2336
2010-03-31	1.2988
2010-06-30	1.3615
2010-09-30	1.475
2010-12-31	1.4784
2011-03-31	1.5221
2011-06-30	1.5554
2011-09-30	1.6469
2011-12-31	1.8318
2012-03-31	1.9216
2012-06-30	1.8447
2012-09-30	1.4973
2012-12-31	1.0841
2013-03-31	0.922
2013-06-30	0.8387
2013-09-30	0.8502
2013-12-31	0.8594
2014-03-31	0.847
2014-06-30	0.9307
2014-09-30	1.02
2014-12-31	1.0451
2015-03-31	1.0364
2015-06-30	1.049
2015-09-30	1.0615
2015-12-31	1.0565
2016-03-31	1.0281
2016-06-30	1.0089
2016-09-30	0.8291
2016-12-31	0.782
2017-03-31	0.7251
2017-06-30	0.6653
2017-09-30	0.6564