Quarter	Percent
1968-01-01	95.9295353803146
1968-04-01	96.7528191720260
1968-07-01	97.1281734162270
1968-10-01	97.0478226417909
1969-01-01	96.0295640974629
1969-04-01	96.9025158448450
1969-07-01	96.9014015275864
1969-10-01	96.6917446317485
1970-01-01	96.2721627838981
1970-04-01	96.7615388987092
1970-07-01	96.5798292345318
1970-10-01	96.8872794137424
1971-01-01	96.5213470558658
1971-04-01	97.0690581380086
1971-07-01	96.7579935489329
1971-10-01	96.9171883285425
1972-01-01	96.1429096824295
1972-04-01	96.8036313310693
1972-07-01	96.8580745688209
1972-10-01	96.7468433704506
1973-01-01	96.4275620940544
1973-04-01	96.9500365164063
1973-07-01	97.1183522750868
1973-10-01	97.0419959393044
1974-01-01	96.3488383972997
1974-04-01	97.0396817652097
1974-07-01	96.7680122742062
1974-10-01	96.7324540999285
1975-01-01	95.5888521562116
1975-04-01	96.1942884700177
1975-07-01	96.1110298581793
1975-10-01	96.2140001519038
1976-01-01	95.2060628960385
1976-04-01	96.0162809207915
1976-07-01	96.0489494614500
1976-10-01	96.2747327323531
1977-01-01	95.4276271839765
1977-04-01	96.0225464835177
1977-07-01	95.9204116070370
1977-10-01	96.0270357879095
1978-01-01	95.3061859821144
1978-04-01	95.9578492427755
1978-07-01	95.7769620031101
1978-10-01	95.7468740319163
1979-01-01	95.4451412236500
1979-04-01	96.2618825093175
1979-07-01	96.4475837802401
1979-10-01	96.2630978892997
1980-01-01	95.7656306697129
1980-04-01	96.2117392132353
1980-07-01	96.2519358337082
1980-10-01	96.1179766367401
1981-01-01	95.9918507186044
1981-04-01	96.0314883341565
1981-07-01	95.8746825298069
1981-10-01	95.5681132659063
1982-01-01	95.6401330674311
1982-04-01	96.2173512222482
1982-07-01	95.8428796021085
1982-10-01	95.9284767864394
1983-01-01	95.3547885191008
1983-04-01	95.8612830069103
1983-07-01	96.0198430559938
1983-10-01	95.8491853964173
1984-01-01	95.4522908024081
1984-04-01	95.8088987277650
1984-07-01	96.0528267358046
1984-10-01	95.9273871994801
1985-01-01	95.3534777641592
1985-04-01	95.8735312952444
1985-07-01	95.8487372513383
1985-10-01	95.4602555897590
1986-01-01	95.2018826395261
1986-04-01	95.5929696312222
1986-07-01	95.9248020778473
1986-10-01	95.4393908554174
1987-01-01	95.1079979907351
1987-04-01	95.2035082325613
1987-07-01	95.9445603160090
1987-10-01	95.7229995333897
1988-01-01	95.3677359823950
1988-04-01	95.9018429153900
1988-07-01	96.2101218162270
1988-10-01	96.2007363627710
1989-01-01	95.9664207635142
1989-04-01	96.2862349646332
1989-07-01	96.4231882117801
1989-10-01	96.1694942560695
1990-01-01	96.1011174991796
1990-04-01	96.4084998496240
1990-07-01	96.4168515657157
1990-10-01	96.4700328895895
1991-01-01	96.2319192768324
1991-04-01	96.5587346626649
1991-07-01	96.3945150014938
1991-10-01	96.7463044901775
1992-01-01	96.6530342745874
1992-04-01	96.5559508040241
1992-07-01	96.3249430717597
1992-10-01	96.5403899188467
1993-01-01	96.0354810150903
1993-04-01	96.4421320922708
1993-07-01	96.1023240208127
1993-10-01	96.1558722796602
1994-01-01	95.4076559090769
1994-04-01	95.6125050952965
1994-07-01	95.5747475453413
1994-10-01	95.5884304593752
1995-01-01	94.9755825113328
1995-04-01	95.3393539307291
1995-07-01	95.6603307870832
1995-10-01	95.3149114787618
1996-01-01	94.9352009581228
1996-04-01	95.3113007443918
1996-07-01	95.6425002752268
1996-10-01	95.3172090043248
1997-01-01	95.3169505549174
1997-04-01	95.5078072527724
1997-07-01	95.0931857691101
1997-10-01	95.0105764881111
1998-01-01	94.7173092297344
1998-04-01	94.4692583707758
1998-07-01	94.2589197876500
1998-10-01	94.0571913655593
1999-01-01	93.6066178480801
1999-04-01	93.4895484185508
1999-07-01	93.9655596938703
1999-10-01	94.0487121891117
2000-01-01	93.2118145419159
2000-04-01	93.5795988564009
2000-07-01	93.7168581367476
2000-10-01	93.8588790165330
2001-01-01	93.1369906199064
2001-04-01	93.0549769210364
2001-07-01	92.9946342901692
2001-10-01	92.3817590440887
2002-01-01	92.0519822195865
2002-04-01	92.1428290491465
2002-07-01	92.1321752827224
2002-10-01	92.2270556755988
2003-01-01	91.9413115404933
2003-04-01	91.8732482389008
2003-07-01	92.2941719665753
2003-10-01	92.5421948725788
2004-01-01	92.0254516280870
2004-04-01	92.3292874430834
2004-07-01	92.2024106004487
2004-10-01	92.3311612127869
2005-01-01	92.0647854834265
2005-04-01	92.3735157233617
2005-07-01	92.4032492427193
2005-10-01	92.4240941745399
2006-01-01	92.2996257832301
2006-04-01	92.8543611299988
2006-07-01	92.4903158209104
2006-10-01	92.5730327318446
2007-01-01	92.6119814602333
2007-04-01	93.1743793589493
2007-07-01	93.0050997582604
2007-10-01	92.9502870371568
2008-01-01	92.6491065749351
2008-04-01	92.8870126986193
2008-07-01	92.6918199705477
2008-10-01	92.4162217661881
2009-01-01	91.7757231560956
2009-04-01	91.2832861226541
2009-07-01	91.1857383877369
2009-10-01	91.4687057626105
2010-01-01	91.4748038926812
2010-04-01	91.6490832114346
2010-07-01	91.5132596861468
2010-10-01	91.5142741437856
2011-01-01	91.7589942390204
2011-04-01	91.8286394287981
2011-07-01	91.6526105786390
2011-10-01	91.6270548483642
2012-01-01	91.5740207132642
2012-04-01	91.6059182773105
2012-07-01	91.5043171397688
2012-10-01	91.6798825795864
2013-01-01	91.1520383078388
2013-04-01	91.9307693387743
2013-07-01	91.8608824947848
2013-10-01	92.0566274201702
2014-01-01	92.0310946557048
2014-04-01	92.5959922115310
2014-07-01	92.0551733690814
2014-10-01	92.1581758167280
2015-01-01	92.1538091893712
2015-04-01	92.3181015782200
2015-07-01	92.1264975415177
2015-10-01	92.3627060301906
2016-01-01	92.5080512764027
2016-04-01	92.4232372884931
2016-07-01	92.7149918363624
2016-10-01	92.6809453808030
2017-01-01	92.7067918445730
2017-04-01	92.6783038437476
2017-07-01	92.7851648576494
2017-10-01	93.1004889458212
2018-01-01	93.1502096704730
2018-04-01	93.2036472191576
2018-07-01	93.2932290951923