Quarter	Percent
1978-03-31	6.8186
1978-06-30	9.0244
1978-09-30	9.6615
1978-12-31	11.6294
1979-03-31	12.6633
1979-06-30	12.2251
1979-09-30	14.0866
1979-12-31	15.6844
1980-03-31	17.6706
1980-06-30	17.1437
1980-09-30	16.1197
1980-12-31	15.5257
1981-03-31	13.3165
1981-06-30	12.4741
1981-09-30	14.2538
1981-12-31	15.6194
1982-03-31	14.3547
1982-06-30	13.3601
1982-09-30	11.4575
1982-12-31	9.9247
1983-03-31	11.1634
1983-06-30	10.1443
1983-09-30	9.8151
1983-12-31	9.3671
1984-03-31	9.2547
1984-06-30	9.2557
1984-09-30	11.1502
1984-12-31	10.1545
1985-03-31	12.9974
1985-06-30	12.6219
1985-09-30	11.7038
1985-12-31	11.623
1986-03-31	12.4512
1986-06-30	10.166
1986-09-30	9.9897
1986-12-31	11.1944
1987-03-31	10.5925
1987-06-30	9.1597
1987-09-30	9.7826
1987-12-31	9.2347
1988-03-31	9.024
1988-06-30	8.4419
1988-09-30	11.3786
1988-12-31	12.4865
1989-03-31	13.0567
1989-06-30	13.4899
1989-09-30	13.9266
1989-12-31	15.0837
1990-03-31	15.1879
1990-06-30	15.1081
1990-09-30	14.9563
1990-12-31	13.827
1991-03-31	13.2324
1991-06-30	11.5775
1991-09-30	10.7687
1991-12-31	10.5415
1992-03-31	10.5494
1992-06-30	10.2149
1992-09-30	10.155
1992-12-31	7.5734
1993-03-31	6.3425
1993-06-30	5.9417
1993-09-30	5.9033
1993-12-31	5.5545
1994-03-31	5.2536
1994-06-30	5.1684
1994-09-30	5.4697
1994-12-31	6.1113
1995-03-31	6.6557
1995-06-30	6.6756
1995-09-30	6.7705
1995-12-31	6.6263
1996-03-31	6.1967
1996-06-30	5.9598
1996-09-30	5.7495
1996-12-31	6.1873
1997-03-31	6.2424
1997-06-30	6.4936
1997-09-30	7.1042
1997-12-31	7.4645
1998-03-31	7.4713
1998-06-30	7.4957
1998-09-30	7.582
1998-12-31	6.8069
1999-03-31	5.5015
1999-06-30	5.1976
1999-09-30	5.1875
1999-12-31	5.8927
2000-03-31	6.1194
2000-06-30	6.1929
2000-09-30	6.1236
2000-12-31	5.9948
2001-03-31	5.6395
2001-06-30	5.228
2001-09-30	4.9309
2001-12-31	4.1016
2002-03-31	4.0055
2002-06-30	4.0991
2002-09-30	3.9486
2002-12-31	3.9188
2003-03-31	3.7321
2003-06-30	3.5709
2003-09-30	3.5012
2003-12-31	3.8566
2004-03-31	4.1106
2004-06-30	4.5131
2004-09-30	4.8507
2004-12-31	4.8184
2005-03-31	4.8495
2005-06-30	4.8254
2005-09-30	4.5539
2005-12-31	4.5574
2006-03-31	4.5279
2006-06-30	4.6432
2006-09-30	4.8548
2006-12-31	5.1683
2007-03-31	5.4935
2007-06-30	5.7247
2007-09-30	6.2909
2007-12-31	6.3039
2008-03-31	5.6837
2008-06-30	5.8648
2008-09-30	5.812
2008-12-31	4.6482
2009-03-31	2.0571
2009-06-30	1.327
2009-09-30	0.8181
2009-12-31	0.5891
2010-03-31	0.6003
2010-06-30	0.6578
2010-09-30	0.7515
2010-12-31	0.7516
2011-03-31	0.7783
2011-06-30	0.817
2011-09-30	0.9052
2011-12-31	1.0517
2012-03-31	1.0934
2012-06-30	1.0121
2012-09-30	0.7394
2012-12-31	0.5138
2013-03-31	0.4898
2013-06-30	0.485
2013-09-30	0.4872
2013-12-31	0.5092
2014-03-31	0.5302
2014-06-30	0.5441
2014-09-30	0.5482
2014-12-31	0.5345
2015-03-31	0.53
2015-06-30	0.5415
2015-09-30	0.5689
2015-12-31	0.57
2016-03-31	0.5653
2016-06-30	0.5643
2016-09-30	0.4561
2016-12-31	0.3775
2017-03-31	0.3383
2017-06-30	0.3252
2017-09-30	0.3159