Quarter	Percent
1978-04-01	38.8493371742939
1978-07-01	39.3557427564397
1978-10-01	39.0941445495966
1979-01-01	39.1751394686547
1979-04-01	39.3805803597897
1979-07-01	39.5262477354087
1979-10-01	38.8923780513751
1980-01-01	38.8199078247259
1980-04-01	38.7892113403461
1980-07-01	38.6277711053309
1980-10-01	38.5864396270588
1981-01-01	38.7694109234453
1981-04-01	38.9015226796958
1981-07-01	38.8758734869711
1981-10-01	38.9100475030888
1982-01-01	38.9185425113590
1982-04-01	39.3765829975392
1982-07-01	39.5444199451895
1982-10-01	39.0358164273340
1983-01-01	39.3397771198156
1983-04-01	39.6568309333838
1983-07-01	39.7190348484782
1983-10-01	39.5362603702856
1984-01-01	39.4212435514711
1984-04-01	39.3010844742249
1984-07-01	39.6094234499901
1984-10-01	39.4679290768912
1985-01-01	39.2939883241572
1985-04-01	39.4935257758157
1985-07-01	39.2635747130283
1985-10-01	38.7337826588391
1986-01-01	38.3172653723590
1986-04-01	37.9831560649208
1986-07-01	38.2320586230158
1986-10-01	37.9222784744184
1987-01-01	37.9419806287916
1987-04-01	37.9967338264885
1987-07-01	38.2149661913528
1987-10-01	38.0139868919517
1988-01-01	37.6053781943515
1988-04-01	37.4717119148807
1988-07-01	37.9575251594712
1988-10-01	37.4494533776587
1989-01-01	37.2548959810874
1989-04-01	36.8689846403697
1989-07-01	36.8106752297660
1989-10-01	36.4335127328174
1990-01-01	36.5331972639533
1990-04-01	36.1714604391231
1990-07-01	36.1735353652363
1990-10-01	36.1377766690552
1991-01-01	36.5304388267440
1991-04-01	36.6045918445559
1991-07-01	37.1875731603500
1991-10-01	37.1225223722414
1992-01-01	36.9468473362396
1992-04-01	37.1896741856432
1992-07-01	37.1347048910502
1992-10-01	37.2752244431376
1993-01-01	37.4152277650629
1993-04-01	37.9360381674686
1993-07-01	37.7617083282453
1993-10-01	37.0858673890007
1994-01-01	37.0633956872294
1994-04-01	37.3016331071221
1994-07-01	37.0205132133167
1994-10-01	36.8806935984190
1995-01-01	36.6679048637440
1995-04-01	36.5404645485369
1995-07-01	36.4704872327561
1995-10-01	36.1569521622005
1996-01-01	36.3015049599873
1996-04-01	36.5860222984013
1996-07-01	36.5067502516116
1996-10-01	36.5253532018861
1997-01-01	36.5474925057493
1997-04-01	36.9672199407818
1997-07-01	37.1277052700183
1997-10-01	36.8637809006348
1998-01-01	37.0557531386961
1998-04-01	37.0462598777261
1998-07-01	36.9386572850666
1998-10-01	36.9699506131543
1999-01-01	37.3057298869548
1999-04-01	37.4133667563650
1999-07-01	37.2999067624947
1999-10-01	36.9278912519330
2000-01-01	37.1181925687247
2000-04-01	36.8529913544782
2000-07-01	36.6129667440232
2000-10-01	36.8661372179098
2001-01-01	37.0441600331073
2001-04-01	36.5349566281494
2001-07-01	36.7035080241846
2001-10-01	36.5265907904796
2002-01-01	36.5835574221713
2002-04-01	36.8245027362748
2002-07-01	36.7673410659335
2002-10-01	36.3709033652058
2003-01-01	36.0415375440164
2003-04-01	36.4186667997841
2003-07-01	36.7128661420335
2003-10-01	36.4808591078983
2004-01-01	36.6315665840107
2004-04-01	36.6097515714768
2004-07-01	36.7007924786526
2004-10-01	36.2223995292946
2005-01-01	35.8354618220719
2005-04-01	35.5572497166874
2005-07-01	35.5803720696865
2005-10-01	35.4385885077505
2006-01-01	35.4767418829571
2006-04-01	35.3197294679918
2006-07-01	35.1289786162384
2006-10-01	35.0541902783353
2007-01-01	35.0283157983469
2007-04-01	34.9056579446094
2007-07-01	34.8680683858315
2007-10-01	34.4984161071315
2008-01-01	34.5658187990472
2008-04-01	34.4338514330957
2008-07-01	34.5786315147219
2008-10-01	34.4987783439862
2009-01-01	34.3211275930915
2009-04-01	34.4583889352883
2009-07-01	34.8399931004576
2009-10-01	34.6533705497150
2010-01-01	34.7104211864789
2010-04-01	34.7826146445578
2010-07-01	34.7233539505182
2010-10-01	34.2246034361603
2011-01-01	34.3870148400521
2011-04-01	34.6319844705550
2011-07-01	34.6754773572738
2011-10-01	34.6150984659451
2012-01-01	34.7650453746166
2012-04-01	34.7609197235756
2012-07-01	34.9974834842513
2012-10-01	34.8539574463595
2013-01-01	34.8424202750283
2013-04-01	34.8229038647706
2013-07-01	35.2536442111852
2013-10-01	35.2988237520268
2014-01-01	35.2255263441113
2014-04-01	35.2567171544892
2014-07-01	35.3820073468394
2014-10-01	35.2812576595015
2015-01-01	34.9983470919254
2015-04-01	35.0598455195003
2015-07-01	35.1993811589072
2015-10-01	34.7089288829955
2016-01-01	34.8031130260733
2016-04-01	34.9770119048346
2016-07-01	35.4886514899238
2016-10-01	35.2129895371902
2017-01-01	35.1379213409314
2017-04-01	34.8550234223698
2017-07-01	34.9321928058350
2017-10-01	34.3975479143739
2018-01-01	34.2371622991858
2018-04-01	34.2766208809998
2018-07-01	34.6471502111642