Quarter	Percent
1986-01-01	84.1415465268676
1986-04-01	80.4290429042904
1986-07-01	78.5239361702128
1986-10-01	80.1534356237492
1987-01-01	81.3377926421405
1987-04-01	78.5282258064516
1987-07-01	77.8602767465406
1987-10-01	80.1082543978349
1988-01-01	77.8682959945689
1988-04-01	74.9658469945355
1988-07-01	73.1363792511164
1988-10-01	75.2933057280884
1989-01-01	76.7522553782096
1989-04-01	72.3463687150838
1989-07-01	71.2881712881713
1989-10-01	74.6746394653535
1990-01-01	72.7112676056338
1990-04-01	72.4028268551237
1990-07-01	70.7904998227579
1990-10-01	74.1935483870968
1991-01-01	73.1655441332861
1991-04-01	70.0603050727208
1991-07-01	69.2253020611230
1991-10-01	73.1603270529684
1992-01-01	72.6626377532883
1992-04-01	68.4098185699040
1992-07-01	66.8330955777461
1992-10-01	70.5861329521086
1993-01-01	70.5187835420394
1993-04-01	68.0286738351254
1993-07-01	66.0431654676259
1993-10-01	70.5479452054794
1994-01-01	70.9025270758123
1994-04-01	68.0404916847433
1994-07-01	69.3115942028986
1994-10-01	71.9056261343013
1995-01-01	71.8852161278605
1995-04-01	69.3929480189022
1995-07-01	69.5050946142649
1995-10-01	74.1172187841281
1996-01-01	71.5222141296431
1996-04-01	68.9617486338798
1996-07-01	69.9415631848064
1996-10-01	71.8418161845478
1997-01-01	70.4328686720470
1997-04-01	68.5314685314685
1997-07-01	67.7133357960842
1997-10-01	72.0163083765752
1998-01-01	71.2639405204461
1998-04-01	67.1023151605676
1998-07-01	65.7421289355322
1998-10-01	67.3561489281685
1999-01-01	67.6981132075472
1999-04-01	64.2803030303030
1999-07-01	65.6427758816837
1999-10-01	68.9825360668185
2000-01-01	68.4770224078997
2000-04-01	62.4620060790274
2000-07-01	63.4257500949487
2000-10-01	68.9158453373768
2001-01-01	67.4110522331567
2001-04-01	63.9276290991331
2001-07-01	64.8689138576779
2001-10-01	68.5247120029729
2002-01-01	69.9300699300699
2002-04-01	64.4209759650400
2002-07-01	64.5743145743146
2002-10-01	68.0128663330951
2003-01-01	66.8668315083010
2003-04-01	63.3566433566434
2003-07-01	63.8290479499652
2003-10-01	67.1043538355218
2004-01-01	66.3230240549828
2004-04-01	64.3516934656175
2004-07-01	63.5402455661664
2004-10-01	68.4568320870156
2005-01-01	67.3552319674907
2005-04-01	64.5172180958812
2005-07-01	63.6700336700337
2005-10-01	66.5772712034864
2006-01-01	69.3360026693360
2006-04-01	65.9355267530741
2006-07-01	64.6883289124668
2006-10-01	69.2842942345924
2007-01-01	68.6527639854353
2007-04-01	64.4797879390325
2007-07-01	66.3126452041155
2007-10-01	68.5031530036508
2008-01-01	65.9807500829738
2008-04-01	64.6863591105211
2008-07-01	63.7931034482759
2008-10-01	67.5174013921114
2009-01-01	65.2993714852795
2009-04-01	63.1804684922468
2009-07-01	60.0460374876685
2009-10-01	64.7559777268261
2010-01-01	61.7090671885192
2010-04-01	60.2405721716515
2010-07-01	58.9303079416532
2010-10-01	62.6614987080103
2011-01-01	63.4052140328291
2011-04-01	59.6079691516710
2011-07-01	58.6273252084670
2011-10-01	62.3239436619718
2012-01-01	63.0956188039655
2012-04-01	59.5588235294118
2012-07-01	59.7124600638978
2012-10-01	59.4835830411221
2013-01-01	59.5101781170484
2013-04-01	57.1337983512999
2013-07-01	58.3201768234923
2013-10-01	63.7676609105180
2014-01-01	63.2366697848456
2014-04-01	60.0309597523220
2014-07-01	59.7175314706785
2014-10-01	65.9872223912382
2015-01-01	66.5155636143850
2015-04-01	61.9204307508226
2015-07-01	61.2682345936290
2015-10-01	65.0695060632949
2016-01-01	66.0598943041691
2016-04-01	62.7684271619269
2016-07-01	63.4259259259259
2016-10-01	67.5332177931831
2017-01-01	68.1844380403458
2017-04-01	63.0835734870317
2017-07-01	63.3064516129032
2017-10-01	67.0798501008936
2018-01-01	66.8202764976959
2018-04-01	64.2939481268012
2018-07-01	61.9584055459272