Quarter	Percent
1978-04-01	30.3306397539062
1978-07-01	31.4028939016962
1978-10-01	30.1795024022655
1979-01-01	28.0793533071404
1979-04-01	30.1555376807349
1979-07-01	30.7397042165448
1979-10-01	29.1238624034928
1980-01-01	27.0727753987511
1980-04-01	28.2077704822067
1980-07-01	28.5517793477722
1980-10-01	27.4667168475913
1981-01-01	26.1452355391472
1981-04-01	28.0852611024521
1981-07-01	28.8311120334153
1981-10-01	28.2985665466104
1982-01-01	26.2847327626849
1982-04-01	28.6940339397389
1982-07-01	29.7192201150506
1982-10-01	28.2835150664219
1983-01-01	27.1798239454304
1983-04-01	29.1787817294810
1983-07-01	29.9238717036858
1983-10-01	28.5525761302466
1984-01-01	27.1899251492443
1984-04-01	28.9956336509408
1984-07-01	30.0727750621415
1984-10-01	29.6569168693989
1985-01-01	27.4434909701237
1985-04-01	29.1434232781847
1985-07-01	29.6619976909785
1985-10-01	28.8810077971506
1986-01-01	26.5240856881812
1986-04-01	27.9616705090317
1986-07-01	29.2993482446158
1986-10-01	28.1827791493013
1987-01-01	26.8352563778591
1987-04-01	29.1655846756905
1987-07-01	30.0162465100293
1987-10-01	28.7967452261082
1988-01-01	27.1067068581336
1988-04-01	29.2956120730528
1988-07-01	30.3410895635614
1988-10-01	29.0987292571308
1989-01-01	26.5492744550918
1989-04-01	28.4732074177832
1989-07-01	28.6016595410937
1989-10-01	27.9979627408850
1990-01-01	26.6605391382483
1990-04-01	28.4122530170639
1990-07-01	28.6098681434619
1990-10-01	27.9021850075217
1991-01-01	28.0419474406814
1991-04-01	30.6140394221531
1991-07-01	31.9696090501168
1991-10-01	30.7434738540378
1992-01-01	29.2422944325658
1992-04-01	31.3429849674656
1992-07-01	31.2413586823000
1992-10-01	30.6278890057144
1993-01-01	29.1594584802813
1993-04-01	32.5571600153133
1993-07-01	32.6632851625278
1993-10-01	30.7167361228795
1994-01-01	27.8544664548328
1994-04-01	30.6311264274916
1994-07-01	30.3821146676128
1994-10-01	28.8272542262498
1995-01-01	26.9704537706144
1995-04-01	28.8892836967368
1995-07-01	29.3934588719337
1995-10-01	28.1855136453878
1996-01-01	26.9372456494363
1996-04-01	28.8487177322166
1996-07-01	29.1940270863911
1996-10-01	28.3692538608839
1997-01-01	27.6078376248065
1997-04-01	30.4876184889724
1997-07-01	31.8010885311087
1997-10-01	29.8775276823585
1998-01-01	28.6725999972387
1998-04-01	30.9415854373104
1998-07-01	31.1603019557825
1998-10-01	29.7489712680982
1999-01-01	28.8166027881386
1999-04-01	30.8080683155395
1999-07-01	31.0602190311583
1999-10-01	29.6174175692304
2000-01-01	28.7229281713073
2000-04-01	30.3837636677640
2000-07-01	30.4639204436418
2000-10-01	29.7009129710354
2001-01-01	28.5495724520044
2001-04-01	29.6765937400657
2001-07-01	30.0875531141722
2001-10-01	28.9975465415744
2002-01-01	28.4715421015295
2002-04-01	31.2163809592870
2002-07-01	30.9612470053502
2002-10-01	29.4433390002646
2003-01-01	28.0232272947252
2003-04-01	30.7957808067782
2003-07-01	31.2291712449696
2003-10-01	29.0555941213568
2004-01-01	28.1707439126860
2004-04-01	30.3372464191804
2004-07-01	31.4777829610050
2004-10-01	29.4459451312645
2005-01-01	27.8939521936933
2005-04-01	29.4226756885217
2005-07-01	30.2135260004757
2005-10-01	29.2194278268853
2006-01-01	27.9912842358743
2006-04-01	29.8346298184702
2006-07-01	29.9760981833055
2006-10-01	28.9876639069453
2007-01-01	28.1230428383927
2007-04-01	29.7994418094696
2007-07-01	30.5289724100693
2007-10-01	28.5015126175241
2008-01-01	27.4646295922219
2008-04-01	29.1371674154459
2008-07-01	30.5152849296244
2008-10-01	29.8647971901783
2009-01-01	28.9177734320419
2009-04-01	31.2379587588710
2009-07-01	32.6407746990647
2009-10-01	30.7851436116442
2010-01-01	29.8779642728368
2010-04-01	32.0602257289306
2010-07-01	33.1171686010531
2010-10-01	31.2416672675919
2011-01-01	29.9612007191127
2011-04-01	32.5162410421097
2011-07-01	32.8522825234720
2011-10-01	32.0938846488866
2012-01-01	30.8762295270765
2012-04-01	32.5704307167339
2012-07-01	33.9811847770996
2012-10-01	32.4844785195506
2013-01-01	31.5608837984826
2013-04-01	33.4314856886905
2013-07-01	34.1007315305216
2013-10-01	33.5959015999991
2014-01-01	32.3805927476758
2014-04-01	34.0221822421210
2014-07-01	34.5778542321395
2014-10-01	32.7065453142701
2015-01-01	31.5156841368084
2015-04-01	33.1323304925990
2015-07-01	34.0020791867149
2015-10-01	32.2126054414154
2016-01-01	31.8543963452622
2016-04-01	33.0588257241906
2016-07-01	34.3668827879540
2016-10-01	33.5658205880572
2017-01-01	32.2074318782854
2017-04-01	33.8237591936217
2017-07-01	33.7814639163682
2017-10-01	32.6863919572447
2018-01-01	30.8456818983064
2018-04-01	32.2073424039127
2018-07-01	33.4843476141062