Quarter	Percent
1986-01-01	72.5063590116279
1986-04-01	72.1237731733915
1986-07-01	71.7979008587396
1986-10-01	72.1847102007522
1987-01-01	72.2671607393014
1987-04-01	71.9122426868906
1987-07-01	71.6714008747013
1987-10-01	72.0658332583866
1988-01-01	70.5782007541749
1988-04-01	69.7229581069552
1988-07-01	68.3756846547544
1988-10-01	69.0724884565383
1989-01-01	67.6954087346025
1989-04-01	66.7652727354220
1989-07-01	66.6367994265490
1989-10-01	67.5779505047798
1990-01-01	67.3242196197177
1990-04-01	67.4283174038675
1990-07-01	66.6370896184561
1990-10-01	67.0202421992398
1991-01-01	65.9092910612065
1991-04-01	65.4042179261863
1991-07-01	64.6481034860776
1991-10-01	65.1027547004810
1992-01-01	64.8397645519948
1992-04-01	65.0911781346564
1992-07-01	64.3955852959068
1992-10-01	65.3912817401855
1993-01-01	65.1058315334773
1993-04-01	65.2556254849556
1993-07-01	65.5267346324257
1993-10-01	66.6209438895795
1994-01-01	66.5584831532647
1994-04-01	67.0740535706681
1994-07-01	67.4890653530936
1994-10-01	68.8602241488687
1995-01-01	68.9674050366377
1995-04-01	69.3828715365239
1995-07-01	69.7071129707113
1995-10-01	70.5654563624250
1996-01-01	70.3115936023867
1996-04-01	70.5479169247285
1996-07-01	70.7848059590930
1996-10-01	70.7952636538698
1997-01-01	70.1799485861183
1997-04-01	70.0085480522652
1997-07-01	69.9012957471871
1997-10-01	70.4110143753796
1998-01-01	69.6070115917444
1998-04-01	68.7845415305176
1998-07-01	68.7215439784036
1998-10-01	69.1874723595867
1999-01-01	69.2366350939156
1999-04-01	68.9450461291616
1999-07-01	69.2936415721784
1999-10-01	70.7389201934220
2000-01-01	70.0271175626097
2000-04-01	69.4165471066475
2000-07-01	70.3021136010827
2000-10-01	71.5851334180432
2001-01-01	71.0730702171501
2001-04-01	70.9653151726322
2001-07-01	71.0563713879678
2001-10-01	72.4104093888606
2002-01-01	72.3737078213380
2002-04-01	71.7762596071734
2002-07-01	71.6095149830090
2002-10-01	72.6156679198956
2003-01-01	71.8922625623833
2003-04-01	71.5611622532864
2003-07-01	72.2810721152034
2003-10-01	72.8871391076116
2004-01-01	72.5851583777935
2004-04-01	72.3372616082382
2004-07-01	72.9731732621906
2004-10-01	74.7629413718039
2005-01-01	73.7981476036460
2005-04-01	73.5043988269795
2005-07-01	74.3263500420460
2005-10-01	75.2458658119036
2006-01-01	74.8358544636703
2006-04-01	74.8436539782381
2006-07-01	74.4353849484090
2006-10-01	74.9541383403475
2007-01-01	75.0556073760494
2007-04-01	74.9471345113078
2007-07-01	74.6760220519797
2007-10-01	75.8463076703328
2008-01-01	73.9232660040611
2008-04-01	74.7153835207058
2008-07-01	74.4599204093235
2008-10-01	75.2721341701238
2009-01-01	73.4215273601924
2009-04-01	73.0398559678046
2009-07-01	72.0036628746522
2009-10-01	72.7365279971915
2010-01-01	72.3291795015402
2010-04-01	71.8621075449269
2010-07-01	72.0836825929030
2010-10-01	72.5691782254130
2011-01-01	72.6254262055529
2011-04-01	72.3215528036733
2011-07-01	72.1773913043478
2011-10-01	72.9642373058075
2012-01-01	72.6381988117161
2012-04-01	72.1362767251869
2012-07-01	71.6014185383492
2012-10-01	71.5278018962942
2013-01-01	72.3571032186459
2013-04-01	72.2607249289625
2013-07-01	72.7234999135397
2013-10-01	74.0315687896333
2014-01-01	74.1151429846545
2014-04-01	73.7675755191406
2014-07-01	73.8611972334844
2014-10-01	75.2135014233428
2015-01-01	74.9468497958357
2015-04-01	74.2480193366456
2015-07-01	73.2945619840235
2015-10-01	74.6395588333001
2016-01-01	74.7623448640084
2016-04-01	75.3388332351208
2016-07-01	75.4522048039631
2016-10-01	76.7336357744653
2017-01-01	76.8296611261435
2017-04-01	75.9698621352998
2017-07-01	76.8253360150688
2017-10-01	77.8780177890724
2018-01-01	77.6601794515354
2018-04-01	77.2900342993801
2018-07-01	77.6659139380254