Quarter	Percent
1960-01-01	83.0916608729160
1960-04-01	86.1128687300985
1960-07-01	85.7084518927806
1960-10-01	85.0591473016198
1961-01-01	83.3769921616300
1961-04-01	85.9799045554667
1961-07-01	85.7504351729686
1961-10-01	84.8213013392181
1962-01-01	82.9919540486308
1962-04-01	85.5824303139691
1962-07-01	84.8772057210716
1962-10-01	83.8347914737279
1963-01-01	81.2571751402390
1963-04-01	84.3308949427849
1963-07-01	83.9311104300582
1963-10-01	83.0541684817284
1964-01-01	80.7215342869532
1964-04-01	83.2280128017530
1964-07-01	82.7018023480622
1964-10-01	82.0633236838801
1965-01-01	80.1360034844745
1965-04-01	82.7343924061618
1965-07-01	82.4600433685644
1965-10-01	81.6245209573724
1966-01-01	80.3682314292189
1966-04-01	82.9201614282551
1966-07-01	82.2528606492581
1966-10-01	81.3605367910197
1967-01-01	79.9438295070418
1967-04-01	82.7037806881909
1967-07-01	82.6951207854283
1967-10-01	81.4583391804767
1968-01-01	80.6465032492952
1968-04-01	83.0861981421693
1968-07-01	82.9608698617899
1968-10-01	82.1676613338279
1969-01-01	80.6233126034242
1969-04-01	83.0067850937624
1969-07-01	82.6538812259916
1969-10-01	81.6593272575629
1970-01-01	80.8146298128084
1970-04-01	82.6577352069606
1970-07-01	82.5352851355433
1970-10-01	81.6325465879395
1971-01-01	81.4287000594885
1971-04-01	83.2627580933866
1971-07-01	82.5962894866817
1971-10-01	81.9874632958888
1972-01-01	81.4225018782524
1972-04-01	83.0445504940740
1972-07-01	82.7554771277961
1972-10-01	81.7416649233559
1973-01-01	81.3730119728857
1973-04-01	82.9142493054850
1973-07-01	82.7724616277389
1973-10-01	82.1161179742616
1974-01-01	81.2862055284685
1974-04-01	82.7175661833742
1974-07-01	82.2793159973990
1974-10-01	81.8153876598826
1975-01-01	80.6454783846667
1975-04-01	81.8745385969372
1975-07-01	81.8553078477739
1975-10-01	81.9154923518746
1976-01-01	80.9392141154450
1976-04-01	81.7601871789327
1976-07-01	81.5393544185774
1976-10-01	81.1483673445307
1977-01-01	80.1741278929072
1977-04-01	81.1895182905096
1977-07-01	81.1663730960808
1977-10-01	80.5883565458725
1978-01-01	79.8856539903648
1978-04-01	81.3721007153485
1978-07-01	80.8085224680523
1978-10-01	80.3613455327640
1979-01-01	79.4168974750322
1979-04-01	81.1197965110466
1979-07-01	80.9343851479969
1979-10-01	80.2518028211724
1980-01-01	79.3084267896836
1980-04-01	80.6250943073916
1980-07-01	80.5025203114444
1980-10-01	80.1227302248201
1981-01-01	79.6950513761354
1981-04-01	80.7994635297507
1981-07-01	80.4121178887255
1981-10-01	79.5965235063413
1982-01-01	79.0140660979558
1982-04-01	80.5906187640591
1982-07-01	80.0152965140859
1982-10-01	79.7443063664959
1983-01-01	79.2275899365741
1983-04-01	80.6130530115478
1983-07-01	80.0301452140097
1983-10-01	79.4175713146222
1984-01-01	78.6157746842357
1984-04-01	79.8713312409032
1984-07-01	79.5345528395015
1984-10-01	78.9984295655907
1985-01-01	78.0787225421335
1985-04-01	79.2058746250478
1985-07-01	78.8517821022129
1985-10-01	78.3111053287284
1986-01-01	77.4660476468107
1986-04-01	78.8425801672889
1986-07-01	78.7337925194806
1986-10-01	77.9901447806891
1987-01-01	77.0149125210195
1987-04-01	78.3362143082794
1987-07-01	78.2421668277675
1987-10-01	77.6117558280871
1988-01-01	76.6963744992947
1988-04-01	78.1452750305453
1988-07-01	77.9086547073204
1988-10-01	77.3185812988816
1989-01-01	76.4298341746088
1989-04-01	77.9806431079400
1989-07-01	77.7950020662492
1989-10-01	77.4175906947883
1990-01-01	76.5143844359945
1990-04-01	78.0447264826574
1990-07-01	77.9345353606419
1990-10-01	77.8524857375713
1991-01-01	77.0918550162174
1991-04-01	78.4347727519729
1991-07-01	78.3378640217732
1991-10-01	78.0338029036850
1992-01-01	77.5554381534878
1992-04-01	78.4418904019034
1992-07-01	78.3648185339437
1992-10-01	78.2643346743995
1993-01-01	77.3355759603910
1993-04-01	78.5230015366531
1993-07-01	78.4360745420634
1993-10-01	78.2515551970859
1994-01-01	77.1651915769083
1994-04-01	78.3133402176312
1994-07-01	78.3328409269870
1994-10-01	77.7043001418902
1995-01-01	76.7679331002975
1995-04-01	77.9446413297081
1995-07-01	78.3536901666884
1995-10-01	77.6967509395510
1996-01-01	76.8049152450786
1996-04-01	78.1329502645199
1996-07-01	78.3980961019499
1996-10-01	77.8389858676621
1997-01-01	77.2725835931803
1997-04-01	78.4795723444775
1997-07-01	78.1006152848713
1997-10-01	77.5020712545662
1998-01-01	76.7792206500564
1998-04-01	77.9529464676616
1998-07-01	77.5715932692089
1998-10-01	77.1916516523873
1999-01-01	76.5592975176962
1999-04-01	77.4212948130790
1999-07-01	77.2385115969339
1999-10-01	76.9407898428096
2000-01-01	76.0099107998092
2000-04-01	76.6994682590995
2000-07-01	76.6424669509345
2000-10-01	76.6739685506047
2001-01-01	75.4768091164584
2001-04-01	76.1681804441537
2001-07-01	75.9360613508096
2001-10-01	75.4687270429872
2002-01-01	74.5081057882282
2002-04-01	75.0978070195814
2002-07-01	75.0914274100391
2002-10-01	74.4630659620605
2003-01-01	73.7657830409872
2003-04-01	74.7609366320529
2003-07-01	74.3216286787789
2003-10-01	73.9118679528877
2004-01-01	73.0389252227442
2004-04-01	73.9675803231144
2004-07-01	73.7840502384503
2004-10-01	73.3157765938254
2005-01-01	72.7443765464568
2005-04-01	73.6718757530940
2005-07-01	73.6804988252406
2005-10-01	73.3683531043814
2006-01-01	72.7219654054783
2006-04-01	73.6257951634487
2006-07-01	73.5113741293116
2006-10-01	73.1670215229783
2007-01-01	72.7601078798526
2007-04-01	73.7484919278346
2007-07-01	73.3914711328610
2007-10-01	72.9909479614200
2008-01-01	72.4573769912781
2008-04-01	73.4287188057278
2008-07-01	72.9444112846789
2008-10-01	72.6249324990118
2009-01-01	71.9935263525684
2009-04-01	72.6442136058310
2009-07-01	72.1956534446940
2009-10-01	71.7151188569190
2010-01-01	71.5005425062922
2010-04-01	72.1987296073824
2010-07-01	71.9806107900236
2010-10-01	71.4764440909282
2011-01-01	71.2066650326986
2011-04-01	71.7403613715701
2011-07-01	71.2802058683746
2011-10-01	71.0274538419833
2012-01-01	70.6445361425130
2012-04-01	71.1388967045880
2012-07-01	70.8654491713457
2012-10-01	70.5420146466252
2013-01-01	70.2489103966347
2013-04-01	70.9494632879318
2013-07-01	70.7418580367288
2013-10-01	70.4159084913634
2014-01-01	70.0740726601002
2014-04-01	70.8890448841932
2014-07-01	70.7195521559651
2014-10-01	70.1808932584041
2015-01-01	70.1268823968148
2015-04-01	70.5311203119621
2015-07-01	70.5376658181599
2015-10-01	70.3019597044017
2016-01-01	69.9570924617748
2016-04-01	70.7553141687985
2016-07-01	70.7048908351763
2016-10-01	70.6083350320042
2017-01-01	70.0838577232106
2017-04-01	70.8058184528881
2017-07-01	70.8869337619145
2017-10-01	70.4741092392846
2018-01-01	70.6197445480267
2018-04-01	71.5032220148315
2018-07-01	71.2908049098213