Quarter	Percent
1968-01-01	66.8435298809476
1968-04-01	70.7316695421218
1968-07-01	70.2823496559555
1968-10-01	68.8413326773087
1969-01-01	66.7416332625596
1969-04-01	70.2955357349776
1969-07-01	69.8729450078644
1969-10-01	68.4847632763791
1970-01-01	66.9325381088804
1970-04-01	70.1772139399483
1970-07-01	69.8247730860232
1970-10-01	68.4339654392764
1971-01-01	67.3536495367165
1971-04-01	69.8986994997462
1971-07-01	69.2391952113282
1971-10-01	68.2225889143679
1972-01-01	66.8768343815618
1972-04-01	69.0553369630635
1972-07-01	68.9918337741227
1972-10-01	68.3103494853823
1973-01-01	67.5173637381639
1973-04-01	69.3056462520447
1973-07-01	69.1712182122256
1973-10-01	68.5832776414239
1974-01-01	66.7350651806113
1974-04-01	68.8639604365943
1974-07-01	68.1711544842606
1974-10-01	67.4621238370765
1975-01-01	65.7492722998654
1975-04-01	68.1148300546361
1975-07-01	68.1045416205080
1975-10-01	67.3964232605348
1976-01-01	66.2007169385351
1976-04-01	67.9850522875886
1976-07-01	68.2050691098990
1976-10-01	67.3733880497604
1977-01-01	66.2159083959012
1977-04-01	68.6433210595886
1977-07-01	68.5093780623286
1977-10-01	67.8447720990168
1978-01-01	66.7156733497848
1978-04-01	69.3535652842802
1978-07-01	68.7609654955309
1978-10-01	68.2127551825831
1979-01-01	67.0062215248507
1979-04-01	69.3991915348309
1979-07-01	69.1772617012827
1979-10-01	68.4525331250379
1980-01-01	66.9440319334141
1980-04-01	69.2988129179811
1980-07-01	69.3068113425454
1980-10-01	68.4448597962882
1981-01-01	67.2446710468407
1981-04-01	69.5671555755747
1981-07-01	69.1669993042129
1981-10-01	68.6818734156366
1982-01-01	67.7030484509087
1982-04-01	69.7796403515944
1982-07-01	69.2055469757888
1982-10-01	69.1177523025502
1983-01-01	68.4546909637097
1983-04-01	70.4831952257188
1983-07-01	70.1285535030553
1983-10-01	69.3441271040633
1984-01-01	68.0715634418491
1984-04-01	70.2130025762845
1984-07-01	70.0500305107379
1984-10-01	69.4257005601572
1985-01-01	68.1682715622106
1985-04-01	70.0068553392419
1985-07-01	69.7028685729402
1985-10-01	68.9630830755592
1986-01-01	68.1278560425575
1986-04-01	69.9461906545344
1986-07-01	69.8244442662555
1986-10-01	68.9115138193169
1987-01-01	67.8719611391762
1987-04-01	69.9671685237719
1987-07-01	69.6885597528191
1987-10-01	69.0788158164088
1988-01-01	68.0996058647240
1988-04-01	70.1095404519522
1988-07-01	69.7566644921398
1988-10-01	69.0808358082387
1989-01-01	68.4307989248554
1989-04-01	70.6071265466055
1989-07-01	70.1533451864641
1989-10-01	69.7551474502861
1990-01-01	69.1265679987502
1990-04-01	71.0441844096662
1990-07-01	70.6866809762051
1990-10-01	70.4923013713849
1991-01-01	69.8007409682822
1991-04-01	71.6524745069685
1991-07-01	71.3784060967888
1991-10-01	71.1972135318039
1992-01-01	70.3672672181222
1992-04-01	71.8800260667189
1992-07-01	71.5006957794339
1992-10-01	71.6439081741203
1993-01-01	70.2515389074696
1993-04-01	72.0241439583533
1993-07-01	71.7346407683520
1993-10-01	71.6740741823659
1994-01-01	70.4752035795251
1994-04-01	72.3031645573520
1994-07-01	71.8006662398255
1994-10-01	71.3518135387826
1995-01-01	70.5651071286668
1995-04-01	72.1605215107571
1995-07-01	72.0534117369894
1995-10-01	71.5725123665789
1996-01-01	70.9295301266773
1996-04-01	72.6673743469962
1996-07-01	72.6693649962381
1996-10-01	72.0439173708394
1997-01-01	71.7503182851679
1997-04-01	73.2477222026618
1997-07-01	73.0757650221345
1997-10-01	72.4905808160133
1998-01-01	71.9305263195110
1998-04-01	73.2531071120598
1998-07-01	73.0208244334999
1998-10-01	72.4763543989840
1999-01-01	71.8242883465864
1999-04-01	73.1259096847811
1999-07-01	72.8941024475120
1999-10-01	72.4162467733402
2000-01-01	71.6394436318367
2000-04-01	73.0795687879640
2000-07-01	72.8005857557225
2000-10-01	72.7405824718128
2001-01-01	72.1784306584245
2001-04-01	73.1165855426385
2001-07-01	72.7779797852569
2001-10-01	72.5478308341632
2002-01-01	71.7872144772162
2002-04-01	72.6282082951154
2002-07-01	72.6728282537381
2002-10-01	72.4328812753690
2003-01-01	71.7321793166384
2003-04-01	72.8489198445563
2003-07-01	72.6381202294931
2003-10-01	72.5042079251065
2004-01-01	71.7066305311560
2004-04-01	72.6425403053241
2004-07-01	72.8325312701868
2004-10-01	72.3418160215033
2005-01-01	71.8488729161406
2005-04-01	73.1131662682176
2005-07-01	73.2062305710257
2005-10-01	72.7728788349357
2006-01-01	72.3879288524902
2006-04-01	73.6379445128420
2006-07-01	73.4690043386797
2006-10-01	73.2284708785560
2007-01-01	72.8786996498064
2007-04-01	74.3514895966623
2007-07-01	73.8405545203641
2007-10-01	73.8751229260882
2008-01-01	73.1810391888382
2008-04-01	74.4859887660182
2008-07-01	74.0684937105540
2008-10-01	74.0028820736268
2009-01-01	73.5102901226246
2009-04-01	74.4073540009462
2009-07-01	74.4280708827102
2009-10-01	74.0286719251632
2010-01-01	73.6556708263168
2010-04-01	74.4661695067878
2010-07-01	74.4844313505350
2010-10-01	74.2142770261329
2011-01-01	73.9753631746432
2011-04-01	75.2040893469041
2011-07-01	74.3941939035168
2011-10-01	74.0170190727497
2012-01-01	73.3696588386909
2012-04-01	74.3539585399670
2012-07-01	74.1319621539694
2012-10-01	74.0923042632721
2013-01-01	74.1757300459293
2013-04-01	75.1710926156950
2013-07-01	75.0506496583795
2013-10-01	75.3132900380468
2014-01-01	74.8708259072417
2014-04-01	75.8665561071406
2014-07-01	75.7974097909264
2014-10-01	75.8511806733719
2015-01-01	75.4709728953327
2015-04-01	76.1141278509892
2015-07-01	76.3479371802981
2015-10-01	76.4022667031500
2016-01-01	76.2859505690931
2016-04-01	76.9716706751217
2016-07-01	77.3295738600233
2016-10-01	77.2681400653641
2017-01-01	76.7862488791547
2017-04-01	77.7597548071128
2017-07-01	77.9958085278954
2017-10-01	77.9663011054992
2018-01-01	78.1611166112784
2018-04-01	79.0138040313657
2018-07-01	79.1917392057550