Quarter	Percent
1968-01-01	83.4848160890809
1968-04-01	85.6428602284207
1968-07-01	85.6059878043787
1968-10-01	84.8173013951766
1969-01-01	83.4521799808768
1969-04-01	85.6023736672253
1969-07-01	85.3900759849161
1969-10-01	84.5344170480058
1970-01-01	83.8331275757859
1970-04-01	85.5277646839598
1970-07-01	85.3953794952092
1970-10-01	84.7648445551336
1971-01-01	84.7868365125221
1971-04-01	86.3127703269150
1971-07-01	85.6110818286305
1971-10-01	85.2265255525827
1972-01-01	84.9225774388738
1972-04-01	86.2595186627633
1972-07-01	86.1177674823840
1972-10-01	85.2147636358416
1973-01-01	84.9628226567998
1973-04-01	86.3801867810951
1973-07-01	86.2087731864500
1973-10-01	85.5758834612972
1974-01-01	85.0848296666877
1974-04-01	86.2636647061840
1974-07-01	85.7921003415535
1974-10-01	85.5098692225910
1975-01-01	84.5479117100305
1975-04-01	85.5703938379510
1975-07-01	85.5720079834779
1975-10-01	85.8523325447276
1976-01-01	85.0410366096894
1976-04-01	85.6315844180089
1976-07-01	85.5329943292792
1976-10-01	85.1773872721715
1977-01-01	84.4614746956970
1977-04-01	85.1857834560658
1977-07-01	85.1320154672568
1977-10-01	84.7816379561106
1978-01-01	84.3913554876191
1978-04-01	85.6540058516339
1978-07-01	84.9481511790824
1978-10-01	84.6852038864825
1979-01-01	84.0258891301819
1979-04-01	85.5276291895072
1979-07-01	85.2670872824718
1979-10-01	84.7892789014693
1980-01-01	83.9742581869078
1980-04-01	85.0609596475209
1980-07-01	84.9560926795450
1980-10-01	84.6706914459346
1981-01-01	84.4066699710316
1981-04-01	85.3578993385409
1981-07-01	84.9384273095958
1981-10-01	84.2786223081934
1982-01-01	84.1135527109032
1982-04-01	85.3974152958433
1982-07-01	84.8216197907277
1982-10-01	84.6659194385481
1983-01-01	84.2830911876026
1983-04-01	85.4338117406298
1983-07-01	84.9280717999262
1983-10-01	84.4487422886168
1984-01-01	83.8880839625700
1984-04-01	84.8353439303696
1984-07-01	84.5467889026734
1984-10-01	84.1341718231713
1985-01-01	83.3442998239760
1985-04-01	84.3137457798368
1985-07-01	83.9184080773080
1985-10-01	83.4936710589173
1986-01-01	82.9373477654891
1986-04-01	83.9938550837329
1986-07-01	83.9570450960814
1986-10-01	83.2339597713390
1987-01-01	82.5474798951947
1987-04-01	83.6394308279694
1987-07-01	83.6663339404556
1987-10-01	83.0002233274866
1988-01-01	82.2530376569589
1988-04-01	83.4838102469036
1988-07-01	83.2639134968643
1988-10-01	82.7601918575525
1989-01-01	82.1890258921871
1989-04-01	83.5149133905941
1989-07-01	83.2204808025514
1989-10-01	82.9123949570045
1990-01-01	82.3841523980528
1990-04-01	83.6543924331415
1990-07-01	83.4497709404450
1990-10-01	83.5384108209815
1991-01-01	82.9872588170609
1991-04-01	84.1194252138774
1991-07-01	83.9276258946288
1991-10-01	83.8659467055427
1992-01-01	83.6132907661286
1992-04-01	84.3817232004214
1992-07-01	84.3088675621451
1992-10-01	84.4365823064451
1993-01-01	83.7244200297197
1993-04-01	84.7332212682794
1993-07-01	84.7337801453818
1993-10-01	84.6936877748578
1994-01-01	83.7491178546224
1994-04-01	84.8077770073688
1994-07-01	84.9029840325031
1994-10-01	84.4489991707974
1995-01-01	83.6696985019130
1995-04-01	84.7788779269531
1995-07-01	85.0982914968659
1995-10-01	84.8104800874304
1996-01-01	84.2175077069598
1996-04-01	85.3806484780779
1996-07-01	85.6246730741264
1996-10-01	85.2452722579242
1997-01-01	85.0091629102115
1997-04-01	85.9925221473815
1997-07-01	85.7099722590518
1997-10-01	85.2349776201927
1998-01-01	84.8346735792553
1998-04-01	85.8191742970892
1998-07-01	85.5930259233769
1998-10-01	85.4300479713839
1999-01-01	85.0409519935361
1999-04-01	85.7131332293386
1999-07-01	85.5466801471720
1999-10-01	85.3967105974303
2000-01-01	84.8285678864878
2000-04-01	85.6198294823114
2000-07-01	85.5209514335445
2000-10-01	85.5374387653911
2001-01-01	84.7587782310971
2001-04-01	85.5644488663322
2001-07-01	85.3428990202885
2001-10-01	84.9047707801618
2002-01-01	84.4387962535454
2002-04-01	85.0896172780253
2002-07-01	85.1272416391059
2002-10-01	84.7321456218796
2003-01-01	84.3673153935242
2003-04-01	84.9968594467360
2003-07-01	84.8411831356656
2003-10-01	84.7903144457655
2004-01-01	83.9565408682921
2004-04-01	84.6117256747266
2004-07-01	84.6196183732489
2004-10-01	84.4762554699541
2005-01-01	83.8854887185936
2005-04-01	84.5930024746305
2005-07-01	84.8379647812326
2005-10-01	84.7400072707920
2006-01-01	84.4392475543234
2006-04-01	85.2141595197418
2006-07-01	84.9762828976860
2006-10-01	84.8267425113179
2007-01-01	84.8284417092398
2007-04-01	85.7961712857689
2007-07-01	85.3864854310311
2007-10-01	85.2367202727076
2008-01-01	84.7661324549631
2008-04-01	85.7096346521763
2008-07-01	85.4187800878535
2008-10-01	85.2654196230408
2009-01-01	84.6575550295827
2009-04-01	85.3002665929297
2009-07-01	85.0687433252005
2009-10-01	84.7116900536544
2010-01-01	84.6610744339528
2010-04-01	85.2582769107610
2010-07-01	85.0263781182012
2010-10-01	84.7965556826457
2011-01-01	84.6368857424202
2011-04-01	85.6803620015801
2011-07-01	84.7603224705699
2011-10-01	84.5212915198986
2012-01-01	84.0708292659191
2012-04-01	84.6609788550641
2012-07-01	84.4879897980707
2012-10-01	84.3136998992458
2013-01-01	84.1444050620716
2013-04-01	84.9321382438979
2013-07-01	84.8287769333706
2013-10-01	84.6159286126651
2014-01-01	84.5399247741583
2014-04-01	85.3077562752727
2014-07-01	85.0940485396239
2014-10-01	84.7745678992476
2015-01-01	84.7989955241484
2015-04-01	85.0529616660085
2015-07-01	85.2011063521253
2015-10-01	85.2343193646018
2016-01-01	85.0607410218555
2016-04-01	85.7105889045866
2016-07-01	85.7551518248813
2016-10-01	85.6821320259744
2017-01-01	85.1414321584957
2017-04-01	85.7799682970929
2017-07-01	85.8730497941402
2017-10-01	85.7253586776275
2018-01-01	85.6670085305307
2018-04-01	86.5036581228836
2018-07-01	86.3421934586127