Quarter	Percent
1968-01-01	97.1655295528859
1968-04-01	97.6056290610344
1968-07-01	98.0256452523291
1968-10-01	97.8102472749766
1969-01-01	97.0625555444391
1969-04-01	97.7690593511434
1969-07-01	97.8118163171264
1969-10-01	97.3915211516208
1970-01-01	97.2556263673000
1970-04-01	97.5989575969355
1970-07-01	97.4939513521880
1970-10-01	97.7361439327808
1971-01-01	97.6704158546015
1971-04-01	97.7902097105004
1971-07-01	97.5529407214315
1971-10-01	97.7536567391980
1972-01-01	97.4445332269315
1972-04-01	97.7428862265231
1972-07-01	97.8260219342887
1972-10-01	97.6932047523608
1973-01-01	97.6134008962173
1973-04-01	97.9668113152670
1973-07-01	97.9108584295499
1973-10-01	97.8422109109188
1974-01-01	97.5657641697577
1974-04-01	97.8956639879931
1974-07-01	97.7011362758861
1974-10-01	97.8123519754808
1975-01-01	97.2377007131891
1975-04-01	97.4765727672903
1975-07-01	97.5471845367416
1975-10-01	97.8306788961860
1976-01-01	97.2549131563383
1976-04-01	97.6150400989477
1976-07-01	97.5340050901944
1976-10-01	97.8600598278976
1977-01-01	97.2407930745584
1977-04-01	97.5403014842367
1977-07-01	97.3541340429306
1977-10-01	97.5071406660629
1978-01-01	97.3084801030299
1978-04-01	97.6419963691302
1978-07-01	97.5204287888134
1978-10-01	97.5125491066900
1979-01-01	97.2207616127180
1979-04-01	97.7520072778061
1979-07-01	97.9353225824939
1979-10-01	97.7347701076894
1980-01-01	97.2751645029999
1980-04-01	97.5637444608177
1980-07-01	97.6670499973490
1980-10-01	97.7343856272258
1981-01-01	97.6460039444506
1981-04-01	97.7232420667390
1981-07-01	97.4360124606895
1981-10-01	97.2570815760438
1982-01-01	97.4959857837444
1982-04-01	97.8548426596088
1982-07-01	97.4905456257853
1982-10-01	97.6661832126915
1983-01-01	97.5631711416899
1983-04-01	97.8036960138029
1983-07-01	97.8577626882508
1983-10-01	97.6897494134142
1984-01-01	97.4467075841670
1984-04-01	97.7393191581269
1984-07-01	97.8296772980971
1984-10-01	97.7289395077506
1985-01-01	97.3593534637541
1985-04-01	97.6257099899766
1985-07-01	97.5498328298192
1985-10-01	97.3243194456913
1986-01-01	97.1821061783139
1986-04-01	97.5034599331164
1986-07-01	97.7529398774611
1986-10-01	97.2814113283231
1987-01-01	97.1791513181150
1987-04-01	97.3791123988398
1987-07-01	97.7752052473798
1987-10-01	97.5687209869543
1988-01-01	97.4039111035027
1988-04-01	97.5691276424268
1988-07-01	97.8125831969087
1988-10-01	97.6110987694769
1989-01-01	97.5060552801168
1989-04-01	97.8760435091839
1989-07-01	97.8310886305683
1989-10-01	97.5266545760806
1990-01-01	97.5489109065691
1990-04-01	97.7791239242459
1990-07-01	97.7209161534000
1990-10-01	97.7604814982718
1991-01-01	97.6782291551134
1991-04-01	97.8539535295663
1991-07-01	97.6894102774198
1991-10-01	98.0427217584435
1992-01-01	98.0656712137358
1992-04-01	97.9157838630341
1992-07-01	97.6935813077863
1992-10-01	98.0357184157583
1993-01-01	97.6440974755932
1993-04-01	98.0374502033559
1993-07-01	97.7798979541125
1993-10-01	97.9834634389264
1994-01-01	97.4584879543960
1994-04-01	97.5483878630910
1994-07-01	97.6055303834008
1994-10-01	97.5310502657546
1995-01-01	97.1307119734699
1995-04-01	97.4816903438183
1995-07-01	97.8864271225516
1995-10-01	97.6762174391122
1996-01-01	97.3363714957914
1996-04-01	97.7993239013097
1996-07-01	98.0023043181106
1996-10-01	97.7147749398534
1997-01-01	97.7456654529120
1997-04-01	97.8969664854530
1997-07-01	97.6894539427224
1997-10-01	97.4928550930605
1998-01-01	97.4082278581673
1998-04-01	97.5197184841282
1998-07-01	97.4016559864422
1998-10-01	97.3381251424296
1999-01-01	97.1626278674840
1999-04-01	97.3337894762113
1999-07-01	97.4402983735464
1999-10-01	97.5182658239936
2000-01-01	97.1171649328872
2000-04-01	97.2642119472497
2000-07-01	97.3685967313103
2000-10-01	97.5484481667797
2001-01-01	96.9538326351339
2001-04-01	97.0950064880863
2001-07-01	97.0882063640195
2001-10-01	96.8673478536742
2002-01-01	96.4185911257390
2002-04-01	96.5763287388671
2002-07-01	96.8183451406722
2002-10-01	96.7693202669582
2003-01-01	96.4058934572048
2003-04-01	96.4850370533208
2003-07-01	96.6528984350970
2003-10-01	96.7409900708439
2004-01-01	96.3590542201721
2004-04-01	96.4743928630213
2004-07-01	96.3103886415563
2004-10-01	96.3117455097756
2005-01-01	96.2177228404894
2005-04-01	96.1867725978677
2005-07-01	96.1311709137156
2005-10-01	96.1990435199222
2006-01-01	96.2528003833058
2006-04-01	96.3626710598528
2006-07-01	96.1548161593464
2006-10-01	96.3316659232673
2007-01-01	96.2280257004481
2007-04-01	96.4960514844870
2007-07-01	96.3917888138027
2007-10-01	96.3903884345017
2008-01-01	96.3048866260840
2008-04-01	96.3650005507824
2008-07-01	96.1955498442470
2008-10-01	96.1558643515505
2009-01-01	96.0581532644513
2009-04-01	96.1462835234086
2009-07-01	96.1831054556418
2009-10-01	96.1280021444138
2010-01-01	96.2242562905426
2010-04-01	96.3909595208428
2010-07-01	96.2632002591975
2010-10-01	96.1320721695924
2011-01-01	96.2946637354220
2011-04-01	96.2713209044030
2011-07-01	95.8329005003490
2011-10-01	95.8135117332261
2012-01-01	95.6480847100645
2012-04-01	95.7963164111234
2012-07-01	95.6925322241023
2012-10-01	95.5280014589012
2013-01-01	95.5028109441231
2013-04-01	95.8455497705203
2013-07-01	95.7372863878819
2013-10-01	95.7749828546520
2014-01-01	95.5609273672912
2014-04-01	95.9565901762497
2014-07-01	95.4581328160747
2014-10-01	95.4825048136661
2015-01-01	95.6200856784719
2015-04-01	95.5065641144733
2015-07-01	95.4508402450634
2015-10-01	95.6359036099326
2016-01-01	95.6937472790882
2016-04-01	95.4404186286038
2016-07-01	95.7346245073292
2016-10-01	95.7170532492878
2017-01-01	95.5996075092829
2017-04-01	95.4000595435008
2017-07-01	95.6438802552462
2017-10-01	95.7184246505338
2018-01-01	95.6659453071396
2018-04-01	95.6152406421932
2018-07-01	95.7070838480599