Quarter	Percent
1978-04-01	91.8227689939022
1978-07-01	91.4255911722228
1978-10-01	91.8536697990132
1979-01-01	91.5358412197818
1979-04-01	91.9619653974760
1979-07-01	91.9121467065091
1979-10-01	91.9529993670740
1980-01-01	91.3207100072270
1980-04-01	91.4294977285227
1980-07-01	91.7193359934578
1980-10-01	91.9560650212873
1981-01-01	91.4513270530266
1981-04-01	91.5146565573166
1981-07-01	91.4354931842082
1981-10-01	91.0754466592916
1982-01-01	90.6340242220706
1982-04-01	90.6092819185249
1982-07-01	89.8961729845757
1982-10-01	89.0049056044311
1983-01-01	87.5308536037473
1983-04-01	87.3051415173616
1983-07-01	87.5894030642724
1983-10-01	87.9247336953189
1984-01-01	87.7946617487572
1984-04-01	88.2769942429722
1984-07-01	88.1773269378660
1984-10-01	88.3617888099897
1985-01-01	87.7729951042887
1985-04-01	87.6605308352687
1985-07-01	88.4235618671532
1985-10-01	88.8681496016658
1986-01-01	88.4927414941119
1986-04-01	88.4827302256666
1986-07-01	88.5181262032956
1986-10-01	88.4170413543586
1987-01-01	87.7663416114240
1987-04-01	87.9577574914504
1987-07-01	88.2735933767153
1987-10-01	88.0105221074338
1988-01-01	88.1920548050200
1988-04-01	88.7762896539048
1988-07-01	88.4654976767888
1988-10-01	89.0394544339818
1989-01-01	88.2813449117241
1989-04-01	89.0878124185349
1989-07-01	89.1505437628363
1989-10-01	89.7071227742725
1990-01-01	88.9777890830961
1990-04-01	89.3348528567214
1990-07-01	88.7563981041551
1990-10-01	87.8577029519248
1991-01-01	86.6294529792587
1991-04-01	86.4348245395984
1991-07-01	85.7298328142800
1991-10-01	85.4662322426767
1992-01-01	84.5550689400621
1992-04-01	84.5656392372703
1992-07-01	84.3117010524235
1992-10-01	84.1499282016222
1993-01-01	83.4216909048237
1993-04-01	83.7111717084078
1993-07-01	84.0317692655233
1993-10-01	84.2389715902629
1994-01-01	83.3625070848894
1994-04-01	84.3875785177584
1994-07-01	84.9108562862581
1994-10-01	84.9222389410040
1995-01-01	84.6332713794989
1995-04-01	85.3252666044981
1995-07-01	85.5833987527242
1995-10-01	85.8316004236984
1996-01-01	85.3124680598145
1996-04-01	85.4801810426745
1996-07-01	85.4148946882217
1996-10-01	85.4051902512206
1997-01-01	84.6948940768199
1997-04-01	84.8761858073164
1997-07-01	85.1262393051452
1997-10-01	85.2917769755535
1998-01-01	84.7567181471823
1998-04-01	85.0450840404121
1998-07-01	85.0646540912767
1998-10-01	85.3575089012092
1999-01-01	85.1087538648080
1999-04-01	85.4442218662553
1999-07-01	85.4510701554379
1999-10-01	85.5521413977694
2000-01-01	84.9478056130229
2000-04-01	85.6909051075326
2000-07-01	85.9188599126340
2000-10-01	85.7628420329334
2001-01-01	84.8724650220103
2001-04-01	85.4057267860347
2001-07-01	85.3243120084247
2001-10-01	85.4530617031361
2002-01-01	84.9473026203491
2002-04-01	85.6669447654099
2002-07-01	85.7723296008122
2002-10-01	86.0620324255527
2003-01-01	85.6114584259520
2003-04-01	85.4741944861457
2003-07-01	85.6794438857036
2003-10-01	86.1434849141208
2004-01-01	85.9747149454374
2004-04-01	86.2309085785232
2004-07-01	86.2593753180338
2004-10-01	86.7993490681168
2005-01-01	86.6007373128908
2005-04-01	87.0745998023591
2005-07-01	87.2355412464295
2005-10-01	87.1370021272581
2006-01-01	86.6066610703380
2006-04-01	87.0923728320353
2006-07-01	87.5479556144878
2006-10-01	87.6366177864322
2007-01-01	87.4020142472020
2007-04-01	88.1073926703261
2007-07-01	88.4503716938182
2007-10-01	88.4548221252655
2008-01-01	88.3857018320840
2008-04-01	88.2652168853556
2008-07-01	88.2649418428140
2008-10-01	88.2458225564535
2009-01-01	86.3134667809865
2009-04-01	86.0084929765382
2009-07-01	86.2559717334647
2009-10-01	86.5364750596032
2010-01-01	86.5905544058272
2010-04-01	86.8461419334921
2010-07-01	87.3654907776291
2010-10-01	87.8786880815209
2011-01-01	87.6085282029992
2011-04-01	87.5029706081764
2011-07-01	87.1791528372642
2011-10-01	87.1659224099313
2012-01-01	86.7550179732737
2012-04-01	86.8913401720322
2012-07-01	86.5744564498338
2012-10-01	86.6430721161936
2013-01-01	86.2322393129762
2013-04-01	86.2710794489288
2013-07-01	86.1105463409375
2013-10-01	85.9497954970470
2014-01-01	85.6089794441989
2014-04-01	85.9352305645723
2014-07-01	85.6004716456096
2014-10-01	85.8070980989469
2015-01-01	86.0151353452833
2015-04-01	86.3006472420474
2015-07-01	86.0421460125468
2015-10-01	86.3533488376150
2016-01-01	86.2191280471919
2016-04-01	86.5043215872875
2016-07-01	86.3602257980526
2016-10-01	86.7753084770338
2017-01-01	86.1857871162232
2017-04-01	86.8442288198413
2017-07-01	86.5057010082838
2017-10-01	87.0334189786000
2018-01-01	86.6260496454904
2018-04-01	87.0310133290462
2018-07-01	86.8743895991736