Quarter	Percent
1986-01-01	81.3819875776398
1986-04-01	81.8801300913737
1986-07-01	81.6421020140443
1986-10-01	81.5587603559374
1987-01-01	81.7003431185665
1987-04-01	82.1211661099302
1987-07-01	82.1830826215133
1987-10-01	82.1256764882742
1988-01-01	81.1027156430014
1988-04-01	81.6723854990303
1988-07-01	81.3145958807346
1988-10-01	81.4817556065428
1989-01-01	80.9481678094817
1989-04-01	80.6945261918776
1989-07-01	80.7816395365889
1989-10-01	80.5861339943136
1990-01-01	80.7232408145518
1990-04-01	80.9506635891518
1990-07-01	80.6977244993181
1990-10-01	81.4091135990872
1991-01-01	81.5011694662981
1991-04-01	81.6315009526498
1991-07-01	81.3294919541845
1991-10-01	80.8991120743900
1992-01-01	81.2995686656463
1992-04-01	81.6077616077616
1992-07-01	80.8918956233605
1992-10-01	81.2663095728609
1993-01-01	80.8401639344262
1993-04-01	81.0553515571876
1993-07-01	80.6848944233893
1993-10-01	81.2794295708328
1994-01-01	81.1793808918901
1994-04-01	81.3555939869629
1994-07-01	80.8471211118465
1994-10-01	81.5401815072998
1995-01-01	81.3435274129256
1995-04-01	81.5645727662895
1995-07-01	81.5205435134261
1995-10-01	81.5371762740184
1996-01-01	81.8941859723020
1996-04-01	82.0773284235922
1996-07-01	82.4045994440232
1996-10-01	82.0253641386238
1997-01-01	81.7744755244755
1997-04-01	81.7435131603509
1997-07-01	82.0341085271318
1997-10-01	81.8013457620841
1998-01-01	81.7522287119582
1998-04-01	81.2427160645280
1998-07-01	81.0223446587083
1998-10-01	81.7732185381938
1999-01-01	81.6636197440585
1999-04-01	81.6808769792936
1999-07-01	81.3480958754106
1999-10-01	82.3047515019115
2000-01-01	82.0814150714805
2000-04-01	81.6121212121212
2000-07-01	82.1653734238603
2000-10-01	82.2827732364517
2001-01-01	82.2500605180344
2001-04-01	81.9889703654324
2001-07-01	82.0037555272882
2001-10-01	83.1290381015639
2002-01-01	83.0234097610880
2002-04-01	82.2200864968765
2002-07-01	82.6172928276110
2002-10-01	82.9106748612686
2003-01-01	82.5164854749599
2003-04-01	82.0045018362753
2003-07-01	82.5193409319081
2003-10-01	82.5705882352941
2004-01-01	82.7529604877477
2004-04-01	82.2586307782329
2004-07-01	82.8067511534194
2004-10-01	83.5710543168190
2005-01-01	83.6208398675727
2005-04-01	83.2385704339754
2005-07-01	84.1010487281998
2005-10-01	84.3638044608806
2006-01-01	84.1283558013596
2006-04-01	84.0526406528360
2006-07-01	84.1265285033584
2006-10-01	83.6330317260337
2007-01-01	84.0781803634701
2007-04-01	83.9931448157669
2007-07-01	83.6007537258037
2007-10-01	84.2474344355758
2008-01-01	83.2156684126623
2008-04-01	84.2641616851694
2008-07-01	84.4651904138441
2008-10-01	84.8393517202161
2009-01-01	84.0413448432531
2009-04-01	84.2377114314905
2009-07-01	83.6613168490898
2009-10-01	84.1410938738535
2010-01-01	83.9647178559312
2010-04-01	83.6567290829892
2010-07-01	83.6229833003114
2010-10-01	83.7030330466274
2011-01-01	84.2444821731749
2011-04-01	84.1771075457792
2011-07-01	84.1501504912261
2011-10-01	84.4261363636364
2012-01-01	84.5139283683911
2012-04-01	83.8154897494305
2012-07-01	83.6678832116788
2012-10-01	83.3266807321663
2013-01-01	84.1616322808617
2013-04-01	84.0563187596192
2013-07-01	84.8037819673065
2013-10-01	85.1485711039146
2014-01-01	85.3962499291905
2014-04-01	84.8818808635696
2014-07-01	85.5564947872640
2014-10-01	85.4995231951534
2015-01-01	85.7925329756316
2015-04-01	85.4168985862184
2015-07-01	84.5040749570328
2015-10-01	84.9126288517722
2016-01-01	85.4748603351955
2016-04-01	86.2853728749118
2016-07-01	86.6259261262236
2016-10-01	87.4630555107744
2017-01-01	87.2250693999573
2017-04-01	86.7254287686508
2017-07-01	87.3870541611625
2017-10-01	87.3864412119939
2018-01-01	87.4726077428780
2018-04-01	87.4818276220145
2018-07-01	87.6305719309132