Quarter	Percent
1986-01-01	50.9369966546896
1986-04-01	50.2957282121988
1986-07-01	50.1148343306875
1986-10-01	50.6093767972038
1987-01-01	50.7165779897512
1987-04-01	50.9995084670330
1987-07-01	50.1462552865794
1987-10-01	50.9062945396861
1988-01-01	51.4027794628325
1988-04-01	51.7817791712173
1988-07-01	51.9072785247599
1988-10-01	52.4970094513738
1989-01-01	52.6384633765196
1989-04-01	52.4247623236194
1989-07-01	52.3017747996006
1989-10-01	53.1092160204422
1990-01-01	53.1240136242209
1990-04-01	52.4600103312116
1990-07-01	52.1095516263509
1990-10-01	52.9909499172387
1991-01-01	53.2972599709759
1991-04-01	51.8162945078880
1991-07-01	52.6882823941930
1991-10-01	53.0308818068352
1992-01-01	53.3473206607159
1992-04-01	52.4305507969356
1992-07-01	52.8310677655562
1992-10-01	54.3140034198248
1993-01-01	54.9689318288630
1993-04-01	54.1795354806657
1993-07-01	55.5237057018565
1993-10-01	55.9975668351008
1994-01-01	56.2128588249832
1994-04-01	54.9050169590786
1994-07-01	54.6104646807408
1994-10-01	55.9853429635641
1995-01-01	55.6983727538914
1995-04-01	54.3615312414723
1995-07-01	54.3706133628463
1995-10-01	54.8762761054792
1996-01-01	54.8906025418052
1996-04-01	54.0546752075808
1996-07-01	53.3908158944464
1996-10-01	54.5377263410050
1997-01-01	54.0806253927128
1997-04-01	53.7065914807537
1997-07-01	54.6009804091256
1997-10-01	54.4301554909260
1998-01-01	54.2146344532888
1998-04-01	54.0809445266981
1998-07-01	54.4133923238705
1998-10-01	55.3563501872712
1999-01-01	54.6396843369873
1999-04-01	54.2419888395095
1999-07-01	54.6673610687883
1999-10-01	55.5399027381097
2000-01-01	54.7006045528961
2000-04-01	54.2545476383946
2000-07-01	54.2201814110249
2000-10-01	54.3580316818456
2001-01-01	53.4560619408811
2001-04-01	53.5692726298188
2001-07-01	54.0164262465779
2001-10-01	54.3914860184823
2002-01-01	53.9221319804069
2002-04-01	53.3352980772249
2002-07-01	53.3094734615281
2002-10-01	54.1971046953149
2003-01-01	54.5914213480739
2003-04-01	54.5202202871649
2003-07-01	53.9169548174969
2003-10-01	54.7572221973584
2004-01-01	54.6951214900970
2004-04-01	54.6604461729776
2004-07-01	54.6627759338132
2004-10-01	56.1204879230208
2005-01-01	55.7719498364698
2005-04-01	55.6840335584471
2005-07-01	55.3737304929403
2005-10-01	55.3715361964626
2006-01-01	55.5627634894004
2006-04-01	54.7944940227665
2006-07-01	54.1749884848948
2006-10-01	54.5390571371572
2007-01-01	55.1377585268899
2007-04-01	54.4651950523492
2007-07-01	54.5098819100323
2007-10-01	55.6461099642109
2008-01-01	56.2127934453597
2008-04-01	56.0255486189751
2008-07-01	55.5961325396339
2008-10-01	56.3292253058288
2009-01-01	56.0330965568043
2009-04-01	55.9573237151516
2009-07-01	55.6185207846229
2009-10-01	55.8617641212867
2010-01-01	57.6853053552230
2010-04-01	57.9734324560490
2010-07-01	58.9098661727140
2010-10-01	59.2955314107346
2011-01-01	59.6573087861813
2011-04-01	59.9075361047726
2011-07-01	59.8961140893878
2011-10-01	59.7392308815784
2012-01-01	59.8928756187318
2012-04-01	59.4186988914911
2012-07-01	59.3387280581781
2012-10-01	59.5358409923666
2013-01-01	59.6331687628740
2013-04-01	59.5622343464693
2013-07-01	59.0755978416385
2013-10-01	59.9304614797444
2014-01-01	60.1264723455232
2014-04-01	59.5808684681994
2014-07-01	59.4416263991370
2014-10-01	60.0441947373565
2015-01-01	59.5748775455974
2015-04-01	59.5748881971385
2015-07-01	59.6830471828321
2015-10-01	59.8209066431518
2016-01-01	59.4384948919065
2016-04-01	59.4357886011043
2016-07-01	59.4266961095662
2016-10-01	59.5458559609289
2017-01-01	59.4656353896371
2017-04-01	59.5809936233854
2017-07-01	59.7044373897916
2017-10-01	60.0604827257889
2018-01-01	59.9486656309900
2018-04-01	59.8655269427010
2018-07-01	59.2068075168668