Quarter	Percent
1968-01-01	73.6049112917221
1968-04-01	76.6043616738808
1968-07-01	76.2868004643419
1968-10-01	75.6938087204794
1969-01-01	73.6000130822336
1969-04-01	76.2902341610178
1969-07-01	75.9435186979152
1969-10-01	75.3757817109168
1970-01-01	73.5957277400004
1970-04-01	76.2008322907272
1970-07-01	75.6863040087865
1970-10-01	74.9462793699696
1971-01-01	73.5342637516969
1971-04-01	75.1889904926226
1971-07-01	74.9833187864271
1971-10-01	74.5729325533565
1972-01-01	72.9134879870828
1972-04-01	74.7780956684851
1972-07-01	74.9725641316908
1972-10-01	74.9537834111930
1973-01-01	74.0359020345360
1973-04-01	75.3501058085102
1973-07-01	75.3597227528768
1973-10-01	75.3429726418663
1974-01-01	73.4749503652242
1974-04-01	75.1931612841941
1974-07-01	74.5397370409956
1974-10-01	74.0106748772485
1975-01-01	72.1655591703773
1975-04-01	74.2573351754095
1975-07-01	74.3018821410697
1975-10-01	73.7668743960094
1976-01-01	72.3887955621894
1976-04-01	74.2716977184554
1976-07-01	74.5900830074478
1976-10-01	74.3307899546602
1977-01-01	73.0914437059086
1977-04-01	75.2421653806046
1977-07-01	75.1056660289136
1977-10-01	74.9353196884509
1978-01-01	73.6807094231033
1978-04-01	75.7589461934698
1978-07-01	75.4056650070752
1978-10-01	75.4432088134662
1979-01-01	74.4097869383637
1979-04-01	76.1447689249182
1979-07-01	76.1021892507761
1979-10-01	76.0570936333596
1980-01-01	74.8803033566680
1980-04-01	76.4063102512275
1980-07-01	76.2541566784311
1980-10-01	76.1093531788311
1981-01-01	75.0111101848582
1981-04-01	76.3976294186758
1981-07-01	76.2527529130234
1981-10-01	76.5002273464084
1982-01-01	75.7067080251161
1982-04-01	76.8839466326692
1982-07-01	76.4698335308577
1982-10-01	76.8800479256175
1983-01-01	76.0704681232322
1983-04-01	77.3314664670840
1983-07-01	77.4524353815676
1983-10-01	77.2142347551377
1984-01-01	76.1244638030892
1984-04-01	77.5702831299024
1984-07-01	77.6952116902118
1984-10-01	77.7125475625733
1985-01-01	76.5598563126022
1985-04-01	77.8461590783889
1985-07-01	77.8820154083376
1985-10-01	77.4569273019040
1986-01-01	76.7483927621871
1986-04-01	78.0185047788776
1986-07-01	77.9999997231571
1986-10-01	77.5458542254493
1987-01-01	76.7831895192404
1987-04-01	78.0870943023873
1987-07-01	78.2965714139863
1987-10-01	78.1406634718110
1988-01-01	77.5428576864273
1988-04-01	78.9970174921716
1988-07-01	78.8612917924818
1988-10-01	78.6827845394974
1989-01-01	78.3651721336352
1989-04-01	79.7739466462061
1989-07-01	79.5245818721901
1989-10-01	79.4734510920623
1990-01-01	79.3686058237927
1990-04-01	80.1307379926281
1990-07-01	79.8665423922178
1990-10-01	80.0100461927143
1991-01-01	79.7670752135310
1991-04-01	80.4334863182130
1991-07-01	80.2369687426016
1991-10-01	80.7812607653624
1992-01-01	79.9794273398370
1992-04-01	80.6757215697874
1992-07-01	80.1831033261164
1992-10-01	80.7986081824961
1993-01-01	79.3744339720657
1993-04-01	80.4142411988412
1993-07-01	79.9112333930736
1993-10-01	80.2644494959820
1994-01-01	79.0813826576089
1994-04-01	80.2307566389959
1994-07-01	79.4686543025805
1994-10-01	79.5832979025133
1995-01-01	78.8474249321520
1995-04-01	79.7706888234016
1995-07-01	79.6054353331350
1995-10-01	79.3031442614332
1996-01-01	79.0865459369025
1996-04-01	79.8491199493653
1996-07-01	79.8757929513818
1996-10-01	79.6960791348142
1997-01-01	79.7305736069602
1997-04-01	80.3517693707589
1997-07-01	80.0474666721209
1997-10-01	79.9062412544565
1998-01-01	79.5157241906032
1998-04-01	79.5469991654872
1998-07-01	79.2504646585371
1998-10-01	79.0173155911051
1999-01-01	78.3164630062322
1999-04-01	78.7710350960144
1999-07-01	78.9943377041459
1999-10-01	79.0728894479282
2000-01-01	77.9719946669675
2000-04-01	78.9869334645070
2000-07-01	78.8361019839712
2000-10-01	79.0589987814016
2001-01-01	78.6218120217604
2001-04-01	78.7965059151993
2001-07-01	78.5530225375423
2001-10-01	78.5594376252426
2002-01-01	77.7531925910814
2002-04-01	78.0164682195335
2002-07-01	78.0879510169689
2002-10-01	78.6234026650638
2003-01-01	77.8202536845200
2003-04-01	78.4668021850062
2003-07-01	78.4959950062134
2003-10-01	78.8611125212312
2004-01-01	78.3423514100210
2004-04-01	78.8334223766346
2004-07-01	78.9689363428866
2004-10-01	78.9293091319051
2005-01-01	78.5430443574402
2005-04-01	79.4032247177580
2005-07-01	79.4012997152124
2005-10-01	79.2404121839142
2006-01-01	79.1709951068928
2006-04-01	80.0362997206529
2006-07-01	79.8594728416198
2006-10-01	79.8409538954421
2007-01-01	79.5515296870685
2007-04-01	80.7881936712462
2007-07-01	80.3181660799592
2007-10-01	80.6327124460434
2008-01-01	79.9418780286326
2008-04-01	80.3881010832679
2008-07-01	80.3116411099382
2008-10-01	80.5231890255662
2009-01-01	79.7522311930238
2009-04-01	79.4922736250401
2009-07-01	79.6899272235346
2009-10-01	79.9574899053429
2010-01-01	79.6913684754195
2010-04-01	80.0719123843216
2010-07-01	80.2263580221942
2010-10-01	80.2342872878796
2011-01-01	80.2438913793306
2011-04-01	80.7180089077578
2011-07-01	80.6189407079449
2011-10-01	80.6379645038331
2012-01-01	80.0829028165690
2012-04-01	80.6834875016110
2012-07-01	80.4516586501384
2012-10-01	80.8431409381719
2013-01-01	80.7112512833216
2013-04-01	81.4692370765937
2013-07-01	81.4280541926546
2013-10-01	82.0516780649920
2014-01-01	81.7186228346532
2014-04-01	82.2246250855470
2014-07-01	82.1644515540194
2014-10-01	82.7059964621186
2015-01-01	82.3530316572456
2015-04-01	82.5162979959413
2015-07-01	82.7234678661761
2015-10-01	83.0069372175268
2016-01-01	83.0482982638424
2016-04-01	83.1071688571320
2016-07-01	83.7130153984348
2016-10-01	83.8380112994737
2017-01-01	83.6222182971598
2017-04-01	84.0389065902118
2017-07-01	84.2700674082450
2017-10-01	84.8161933119732
2018-01-01	84.8944487352479
2018-04-01	85.2104130687187
2018-07-01	85.4599864749170