Quarter	Percent
1986-01-01	93.7891113892366
1986-04-01	93.7529283148524
1986-07-01	93.1141922417822
1986-10-01	93.3994422063836
1987-01-01	93.4072704867529
1987-04-01	93.1860036832412
1987-07-01	92.6627942525222
1987-10-01	92.3661800486618
1988-01-01	91.2918370437680
1988-04-01	90.9667673716012
1988-07-01	89.2771084337349
1988-10-01	90.2640264026403
1989-01-01	89.0566601883690
1989-04-01	88.5356023287058
1989-07-01	88.1994047619048
1989-10-01	87.9994081089080
1990-01-01	87.8328674415183
1990-04-01	87.1284229023283
1990-07-01	86.4510489510490
1990-10-01	86.5749456915279
1991-01-01	85.4388489208633
1991-04-01	85.1432664756447
1991-07-01	84.3629619061207
1991-10-01	83.9437819420784
1992-01-01	84.3220338983051
1992-04-01	84.7636465953855
1992-07-01	83.8845291479821
1992-10-01	84.1885108756274
1993-01-01	84.4916077125815
1993-04-01	84.6706256041983
1993-07-01	83.8443558366561
1993-10-01	85.0328048113723
1994-01-01	84.6216546664855
1994-04-01	85.7780181154522
1994-07-01	84.7612642905178
1994-10-01	85.9759358288770
1995-01-01	86.3539728939676
1995-04-01	87.1611794261536
1995-07-01	86.8552631578947
1995-10-01	87.2810457516340
1996-01-01	87.1478644683890
1996-04-01	87.0688541532102
1996-07-01	86.8184156378601
1996-10-01	87.1004858092559
1997-01-01	86.7828520544460
1997-04-01	86.5948002536462
1997-07-01	86.5418669365039
1997-10-01	87.0118417737466
1998-01-01	86.1016949152542
1998-04-01	85.2274151108884
1998-07-01	84.4998121948166
1998-10-01	85.4911272181954
1999-01-01	85.1616123798827
1999-04-01	85.0349475786321
1999-07-01	84.9581824990638
1999-10-01	86.6965620328849
2000-01-01	86.5638218462304
2000-04-01	86.8303015200598
2000-07-01	86.9841665627727
2000-10-01	87.4641744548287
2001-01-01	87.2226377461980
2001-04-01	86.8256743256743
2001-07-01	86.8913857677903
2001-10-01	87.6275827732138
2002-01-01	87.6302729528536
2002-04-01	87.6378050291094
2002-07-01	87.4505440158259
2002-10-01	87.7724418175102
2003-01-01	88.1328919946059
2003-04-01	87.4189998777356
2003-07-01	87.6341463414634
2003-10-01	87.9664519265832
2004-01-01	88.2588149763722
2004-04-01	88.9762826718296
2004-07-01	89.1104665216340
2004-10-01	89.8758587441244
2005-01-01	89.7186147186147
2005-04-01	88.8715298641990
2005-07-01	90.1440576230492
2005-10-01	91.1257485029940
2006-01-01	89.8590539894888
2006-04-01	89.8880419247260
2006-07-01	89.9880952380952
2006-10-01	90.3302447137087
2007-01-01	90.0652045050385
2007-04-01	89.8506046952810
2007-07-01	90.2323376007586
2007-10-01	90.0674795785486
2008-01-01	89.2253104671792
2008-04-01	89.6853560444760
2008-07-01	89.0388257575758
2008-10-01	89.4288754877616
2009-01-01	87.3730214977557
2009-04-01	87.9102715466352
2009-07-01	86.9216241737488
2009-10-01	87.4012964054213
2010-01-01	87.6368774284705
2010-04-01	87.4690557585760
2010-07-01	88.0179435721875
2010-10-01	87.7625678546141
2011-01-01	87.9796906364388
2011-04-01	87.9749082731684
2011-07-01	87.8974845752254
2011-10-01	87.7924237026481
2012-01-01	87.9724269075351
2012-04-01	86.7809932118614
2012-07-01	86.1233742990097
2012-10-01	86.7899761336516
2013-01-01	87.7757901013715
2013-04-01	87.8205892878444
2013-07-01	88.4253188699487
2013-10-01	88.9945329213216
2014-01-01	89.0835898650249
2014-04-01	89.6588360288042
2014-07-01	88.9202540578687
2014-10-01	89.1787552643894
2015-01-01	89.3988816402610
2015-04-01	89.3962220419516
2015-07-01	87.8994116968508
2015-10-01	88.8430698739977
2016-01-01	88.8446668182852
2016-04-01	89.8369870713884
2016-07-01	89.9563807180405
2016-10-01	90.3931585961795
2017-01-01	90.2788493331864
2017-04-01	90.2321506789312
2017-07-01	90.5399521010233
2017-10-01	90.6820884228732
2018-01-01	91.0231660231660
2018-04-01	90.3624733475480
2018-07-01	90.7615613067459