Quarter	Percent
1986-01-01	69.0508021390374
1986-04-01	66.6666666666667
1986-07-01	66.5549597855228
1986-10-01	66.5771812080537
1987-01-01	67.9676985195155
1987-04-01	68.7584345479082
1987-07-01	68.3569979716024
1987-10-01	67.4796747967480
1988-01-01	67.0508474576271
1988-04-01	67.1875000000000
1988-07-01	67.5289312457454
1988-10-01	67.8717598908595
1989-01-01	69.1045796308954
1989-04-01	68.5147159479808
1989-07-01	69.5681973954764
1989-10-01	70.7903780068729
1990-01-01	70.4341833218470
1990-04-01	68.4392265193370
1990-07-01	68.9965397923875
1990-10-01	69.3693693693694
1991-01-01	69.5079695079695
1991-04-01	68.3553088133241
1991-07-01	68.6111111111111
1991-10-01	68.3553088133241
1992-01-01	68.0555555555556
1992-04-01	67.7307425399028
1992-07-01	67.2676837725381
1992-10-01	66.6897506925208
1993-01-01	66.2975778546713
1993-04-01	65.1211072664360
1993-07-01	64.2461964038728
1993-10-01	65.0344827586207
1994-01-01	64.4872677219546
1994-04-01	64.2611683848797
1994-07-01	63.7422892392049
1994-10-01	61.2286689419795
1995-01-01	61.9047619047619
1995-04-01	61.0847457627119
1995-07-01	61.8083670715250
1995-10-01	59.5445411922304
1996-01-01	59.0273151232512
1996-04-01	56.3660477453581
1996-07-01	56.4558629776021
1996-10-01	56.8909209666884
1997-01-01	54.4983818770226
1997-04-01	56.1978163134232
1997-07-01	55.1658163265306
1997-10-01	56.6899175649968
1998-01-01	55.5205047318612
1998-04-01	54.1745134965474
1998-07-01	53.3707865168539
1998-10-01	52.3514851485149
1999-01-01	51.0128913443831
1999-04-01	50.8836075563681
1999-07-01	51.9056261343013
1999-10-01	53.6014405762305
2000-01-01	54.7023809523810
2000-04-01	53.5377358490566
2000-07-01	50.3210741389375
2000-10-01	50.4046242774566
2001-01-01	49.8854524627720
2001-04-01	49.5449374288965
2001-07-01	46.8468468468468
2001-10-01	46.9183786785119
2002-01-01	48.2494529540481
2002-04-01	45.3268503511615
2002-07-01	45.1147891083823
2002-10-01	45.5455983131260
2003-01-01	44.0166493236212
2003-04-01	41.7395779722079
2003-07-01	42.3841059602649
2003-10-01	40.9869083585096
2004-01-01	41.9740777666999
2004-04-01	40.3162055335968
2004-07-01	39.2070484581498
2004-10-01	39.7479398933592
2005-01-01	38.3877159309021
2005-04-01	39.0290337934317
2005-07-01	36.8147448015123
2005-10-01	36.2570356472796
2006-01-01	37.2731503024663
2006-04-01	36.5526802218115
2006-07-01	39.0266299357208
2006-10-01	38.5316917464660
2007-01-01	36.8206521739130
2007-04-01	34.8648648648649
2007-07-01	35.6440071556351
2007-10-01	36.2871067789101
2008-01-01	35.3792196405086
2008-04-01	35.2762070465420
2008-07-01	34.8013816925734
2008-10-01	35.4175588865096
2009-01-01	34.9192863211555
2009-04-01	34.1062394603710
2009-07-01	33.8770388958595
2009-10-01	31.6880962256325
2010-01-01	31.6742081447964
2010-04-01	30.4170073589534
2010-07-01	31.3160032493907
2010-10-01	30.2419354838710
2011-01-01	30.5600000000000
2011-04-01	30.6317044100119
2011-07-01	30.7388384037930
2011-10-01	29.8073141958317
2012-01-01	29.3495297805643
2012-04-01	28.8446526151444
2012-07-01	27.8943278943279
2012-10-01	30.3826826439892
2013-01-01	28.4449576597383
2013-04-01	27.0985051743963
2013-07-01	27.9069767441860
2013-10-01	27.4346343311861
2014-01-01	25.9887005649718
2014-04-01	26.8237934904602
2014-07-01	26.4312267657993
2014-10-01	24.8984115256742
2015-01-01	26.7621145374449
2015-04-01	26.8978102189781
2015-07-01	27.8623188405797
2015-10-01	27.5601868487244
2016-01-01	27.5677603423680
2016-04-01	25.3361641896674
2016-07-01	26.9217269217269
2016-10-01	27.4373259052925
2017-01-01	25.5010366275052
2017-04-01	25.5829903978052
2017-07-01	25.3746594005450
2017-10-01	25.4649983090971
2018-01-01	25.5876427132304
2018-04-01	26.3333333333333
2018-07-01	26.1676051672739