Quarter	Percent
1986-01-01	95.8229036295369
1986-04-01	96.0955801967828
1986-07-01	95.5600560835021
1986-10-01	95.7855593430431
1987-01-01	95.8718422674060
1987-04-01	95.6721915285451
1987-07-01	95.4295322531336
1987-10-01	94.9665450121654
1988-01-01	94.4570649704680
1988-04-01	94.6827794561934
1988-07-01	93.9608433734940
1988-10-01	94.6744674467447
1989-01-01	94.1097323964718
1989-04-01	94.0588147484699
1989-07-01	93.4970238095238
1989-10-01	93.0008878366381
1990-01-01	93.5559805796675
1990-04-01	93.3372382486455
1990-07-01	92.7156177156177
1990-10-01	93.5119478638668
1991-01-01	93.2949640287770
1991-04-01	93.3237822349570
1991-07-01	93.1801968897132
1991-10-01	92.7597955706985
1992-01-01	93.1214689265537
1992-04-01	93.1204276871131
1992-07-01	92.5728699551570
1992-10-01	92.4428332403793
1993-01-01	92.6480787904009
1993-04-01	92.4872255213368
1993-07-01	92.0115495668912
1993-10-01	92.7556041552761
1994-01-01	92.1206357831816
1994-04-01	92.5780721914290
1994-07-01	91.4996637525219
1994-10-01	91.7914438502674
1995-01-01	92.0010629816636
1995-04-01	91.8418616950945
1995-07-01	91.4473684210526
1995-10-01	91.7647058823529
1996-01-01	91.8862780734779
1996-04-01	91.4093786332515
1996-07-01	91.4094650205761
1996-10-01	91.7284581948351
1997-01-01	91.8967052537845
1997-04-01	91.4013950538998
1997-07-01	91.7910447761194
1997-10-01	91.9627110103301
1998-01-01	91.6760828625236
1998-04-01	91.0537526625736
1998-07-01	90.5220984099161
1998-10-01	91.1647088227943
1999-01-01	91.0395607138400
1999-04-01	90.6265601597604
1999-07-01	89.9637997753090
1999-10-01	91.2929745889387
2000-01-01	91.0425478974869
2000-04-01	91.0665337652629
2000-07-01	91.1731704276275
2000-10-01	91.1775700934579
2001-01-01	91.1119421590626
2001-04-01	90.6468531468531
2001-07-01	90.6491885143570
2001-10-01	91.5110779188449
2002-01-01	91.7866004962779
2002-04-01	90.9451257277344
2002-07-01	91.1721068249258
2002-10-01	91.0355867504002
2003-01-01	91.5532671325242
2003-04-01	90.4633818315197
2003-07-01	90.4390243902439
2003-10-01	90.5676431262915
2004-01-01	91.1426148067369
2004-04-01	91.2391093901258
2004-07-01	91.2376117959874
2004-10-01	91.9247920935278
2005-01-01	92.2558922558922
2005-04-01	91.3231582742459
2005-07-01	92.2208883553421
2005-10-01	93.2694610778443
2006-01-01	92.5704730052556
2006-04-01	91.9723677941877
2006-07-01	92.2380952380952
2006-10-01	92.3853646947018
2007-01-01	92.1398933017190
2007-04-01	92.0796774958501
2007-07-01	92.0459933617828
2007-10-01	92.0681898899018
2008-01-01	91.3305736250739
2008-04-01	92.0156139105749
2008-07-01	91.5009469696970
2008-10-01	92.1248669741043
2009-01-01	91.0583510512639
2009-04-01	91.6646989374262
2009-07-01	90.8758262511804
2009-10-01	91.5144372421921
2010-01-01	91.7696926880961
2010-04-01	91.6067428975598
2010-07-01	91.6420729547869
2010-10-01	91.5742270474392
2011-01-01	91.7227535718503
2011-04-01	91.6084743756658
2011-07-01	91.6943521594684
2011-10-01	91.7349483434272
2012-01-01	92.1321606845733
2012-04-01	90.8896034297964
2012-07-01	90.4426679393867
2012-10-01	90.5369928400955
2013-01-01	91.1508646392367
2013-04-01	91.5424072527735
2013-07-01	91.6795804029086
2013-10-01	91.8706917043024
2014-01-01	92.3158891783093
2014-04-01	92.4212017471373
2014-07-01	92.0724535403434
2014-10-01	92.0917173607862
2015-01-01	92.5559179869525
2015-04-01	92.4788503882258
2015-07-01	91.2792709655093
2015-10-01	91.5807560137457
2016-01-01	92.0968842392540
2016-04-01	92.8724002248454
2016-07-01	92.9649927301197
2016-10-01	93.5584184806752
2017-01-01	93.1114295161468
2017-04-01	93.1778361804643
2017-07-01	93.0546483779665
2017-10-01	93.0710193492596
2018-01-01	93.3719433719434
2018-04-01	92.8784648187633
2018-07-01	93.3495969452694