Quarter	Percent
1986-01-01	67.8861788617886
1986-04-01	67.3207036535859
1986-07-01	67.6589986468200
1986-10-01	64.7935003385240
1987-01-01	65.5382532159783
1987-04-01	64.0487474610697
1987-07-01	64.6580907244414
1987-10-01	62.7623561272850
1988-01-01	63.6178861788618
1988-04-01	60.3120759837178
1988-07-01	58.2993197278912
1988-10-01	58.3106267029973
1989-01-01	56.8600682593857
1989-04-01	56.6939890710382
1989-07-01	55.8823529411765
1989-10-01	56.7123287671233
1990-01-01	57.2995202193283
1990-04-01	56.5934065934066
1990-07-01	56.5037852718513
1990-10-01	56.0606060606061
1991-01-01	56.3146997929607
1991-04-01	56.4226519337017
1991-07-01	56.6089965397924
1991-10-01	56.4795564795565
1992-01-01	56.8654646324549
1992-04-01	56.3888888888889
1992-07-01	55.9805285118220
1992-10-01	56.3977746870654
1993-01-01	57.2619874913134
1993-04-01	59.9860821155184
1993-07-01	59.9443671766342
1993-10-01	60.5555555555556
1994-01-01	61.1919611919612
1994-04-01	62.2576177285318
1994-07-01	62.5605536332180
1994-10-01	64.0248104755341
1995-01-01	64.4230769230769
1995-04-01	64.0410958904110
1995-07-01	65.5994550408719
1995-10-01	66.0798916723087
1996-01-01	68.8005390835580
1996-04-01	68.2550335570470
1996-07-01	68.4456304202802
1996-10-01	69.0728476821192
1997-01-01	68.5282522996058
1997-04-01	70.5613577023499
1997-07-01	68.5918234912394
1997-10-01	68.7741935483871
1998-01-01	69.7495183044316
1998-04-01	70.7426376440461
1998-07-01	70.4386522568341
1998-10-01	70.3026481715006
1999-01-01	72.2778473091364
1999-04-01	70.5407085146054
1999-07-01	71.7283950617284
1999-10-01	70.5269607843137
2000-01-01	70.6634205721242
2000-04-01	70.8509354254677
2000-07-01	72.0693779904306
2000-10-01	73.8744075829384
2001-01-01	73.8109219025250
2001-04-01	73.4420500873617
2001-07-01	73.6599423631124
2001-10-01	74.1624077228847
2002-01-01	77.0565193060996
2002-04-01	77.3908236594804
2002-07-01	76.8978700163845
2002-10-01	76.8608414239482
2003-01-01	75.1731486414491
2003-04-01	75.9747102212856
2003-07-01	75.9249609171444
2003-10-01	76.8160741885626
2004-01-01	75.8919469928644
2004-04-01	77.8899545683998
2004-07-01	78.4000000000000
2004-10-01	79.8810703666997
2005-01-01	79.3222003929273
2005-04-01	79.3372319688109
2005-07-01	79.5443528841493
2005-10-01	79.8748194511314
2006-01-01	80.8795411089866
2006-04-01	81.8441064638783
2006-07-01	81.2381852551985
2006-10-01	80.4317221961520
2007-01-01	82.7891791044776
2007-04-01	82.0120537783959
2007-07-01	80.8011049723757
2007-10-01	81.9799270072993
2008-01-01	81.7442385901491
2008-04-01	81.6427289048474
2008-07-01	81.1859117253678
2008-10-01	82.1523472099203
2009-01-01	82.8571428571429
2009-04-01	82.8820960698690
2009-07-01	82.3580407455570
2009-10-01	82.1428571428571
2010-01-01	81.5542271562767
2010-04-01	82.8450106157112
2010-07-01	83.5726351351351
2010-10-01	82.0394460763743
2011-01-01	82.0833333333333
2011-04-01	81.9386909693455
2011-07-01	82.7287716405606
2011-10-01	83.5318275154004
2012-01-01	83.6952068824252
2012-04-01	82.9926410466067
2012-07-01	82.2738386308068
2012-10-01	82.3792123426715
2013-01-01	81.7482800485633
2013-04-01	82.8087167070218
2013-07-01	82.3694779116466
2013-10-01	82.1813823411906
2014-01-01	83.6645468998410
2014-04-01	83.8275998418347
2014-07-01	82.6446280991736
2014-10-01	83.2485322896282
2015-01-01	84.1961852861036
2015-04-01	83.1978319783198
2015-07-01	82.6538461538462
2015-10-01	82.7349121466768
2016-01-01	83.0675778283979
2016-04-01	84.4762622456669
2016-07-01	84.7679640718563
2016-10-01	84.9869936826459
2017-01-01	86.8586194167590
2017-04-01	85.8922682301209
2017-07-01	87.0309653916211
2017-10-01	87.6583423814694
2018-01-01	86.7313915857605
2018-04-01	87.7368609224169
2018-07-01	86.9580668088131