Quarter	Percent
1986-01-01	48.6541049798116
1986-04-01	49.6298788694482
1986-07-01	49.6800269450994
1986-10-01	47.9946073474890
1987-01-01	47.7556530543368
1987-04-01	46.8221771467208
1987-07-01	47.1244925575102
1987-10-01	46.8178740690589
1988-01-01	47.2721111487631
1988-04-01	45.4668930390492
1988-07-01	44.0285811500510
1988-10-01	43.5923653715065
1989-01-01	42.0621372482076
1989-04-01	42.3247863247863
1989-07-01	41.5895854744776
1989-10-01	41.2692967409949
1990-01-01	41.7182130584192
1990-04-01	41.9910437478470
1990-07-01	41.7184265010352
1990-10-01	40.9813407049067
1991-01-01	41.1622276029056
1991-04-01	41.6407061266874
1991-07-01	41.4414414414414
1991-10-01	41.7128987517337
1992-01-01	41.6377515614157
1992-04-01	41.4092329052412
1992-07-01	41.2703922249219
1992-10-01	41.5336571825121
1993-01-01	42.7184466019418
1993-04-01	44.7797433229275
1993-07-01	45.1803051317614
1993-10-01	45.0519031141868
1994-01-01	45.5110497237569
1994-04-01	46.6528640441684
1994-07-01	47.1418732782369
1994-10-01	49.1426611796982
1995-01-01	49.3337888623164
1995-04-01	49.6594005449591
1995-07-01	50.2032520325203
1995-10-01	51.4478114478114
1996-01-01	52.9648241206030
1996-04-01	53.8358905937292
1996-07-01	53.6116633532140
1996-10-01	54.0105193951348
1997-01-01	54.4506031953049
1997-04-01	54.4983818770226
1997-07-01	54.5834673528466
1997-10-01	53.7256156060122
1998-01-01	54.6148949713558
1998-04-01	55.5625990491284
1998-07-01	55.4645669291339
1998-10-01	55.8088694565896
1999-01-01	57.0498915401302
1999-04-01	57.2923076923077
1999-07-01	56.1430317848411
1999-10-01	55.7476493782226
2000-01-01	55.0406259404153
2000-04-01	55.7113033104682
2000-07-01	57.6025981694715
2000-10-01	58.9526038619076
2001-01-01	59.6114815888663
2001-04-01	59.5683453237410
2001-07-01	60.5068337129840
2001-10-01	61.6334549536907
2002-01-01	61.8257261410788
2002-04-01	63.7704918032787
2002-07-01	63.8228941684665
2002-10-01	63.4328358208955
2003-01-01	62.8225381779884
2003-04-01	64.3229166666667
2003-07-01	64.7089129314786
2003-10-01	65.4443595620066
2004-01-01	64.6673387096774
2004-04-01	66.9995007488767
2004-07-01	67.8456591639871
2004-10-01	68.6764705882353
2005-01-01	68.9805825242718
2005-04-01	68.4083794847098
2005-07-01	69.8803827751196
2005-10-01	70.6818721786648
2006-01-01	69.6533836359349
2006-04-01	70.9231490159325
2006-07-01	69.5317959468903
2006-10-01	70.0740055504163
2007-01-01	71.4909257983000
2007-04-01	72.3161260849703
2007-07-01	71.5970961887477
2007-10-01	71.8138907619690
2008-01-01	71.5271593944791
2008-04-01	71.7756183745583
2008-07-01	71.4787187362878
2008-10-01	71.7334494773519
2009-01-01	71.6569453445669
2009-04-01	72.0291720291720
2009-07-01	71.6567291311755
2009-10-01	72.6562500000000
2010-01-01	72.7634611355542
2010-04-01	73.4222037075609
2010-07-01	73.2394366197183
2010-10-01	73.2730263157895
2011-01-01	73.3877551020408
2011-04-01	73.1089028594606
2011-07-01	73.7744603590882
2011-10-01	74.2868621936521
2012-01-01	74.4442219106749
2012-04-01	74.3062487522460
2012-07-01	73.7669053301511
2012-10-01	72.8461081402258
2013-01-01	73.6634444663642
2013-04-01	74.9213836477988
2013-07-01	74.0805946791862
2013-10-01	74.7180085569817
2014-01-01	76.0201121639915
2014-04-01	75.8892520669102
2014-07-01	75.9701777862741
2014-10-01	76.8719118206005
2015-01-01	75.6235827664399
2015-04-01	75.5822689706987
2015-07-01	74.4871316672883
2015-10-01	75.2037037037037
2016-01-01	75.0137892995036
2016-04-01	76.7153284671533
2016-07-01	76.0775081492213
2016-10-01	76.5773863023548
2017-01-01	78.0335474660956
2017-04-01	77.6793622674934
2017-07-01	78.2822949665611
2017-10-01	78.8737320741518
2018-01-01	78.1212015974996
2018-04-01	78.4198723477661
2018-07-01	78.4710318820706