Quarter	Percent
1986-01-01	70.9761117202163
1986-04-01	71.7329844263261
1986-07-01	71.8086501258276
1986-10-01	70.7314170088675
1987-01-01	70.9557140351636
1987-04-01	70.6691659621343
1987-07-01	71.5537131554435
1987-10-01	70.5819250880854
1988-01-01	70.2611445339193
1988-04-01	70.2371296446500
1988-07-01	70.0057713101759
1988-10-01	68.9216544840849
1989-01-01	69.6754190824852
1989-04-01	69.8213970554591
1989-07-01	69.9122719526104
1989-10-01	68.5875069857566
1990-01-01	68.9199490649379
1990-04-01	69.4294140274394
1990-07-01	69.8455570537169
1990-10-01	68.3321477868388
1991-01-01	68.6991578645671
1991-04-01	70.5901481139596
1991-07-01	69.1600847057644
1991-10-01	68.5141529045885
1992-01-01	68.1728538643169
1992-04-01	69.3854932740045
1992-07-01	68.4510040358303
1992-10-01	66.3921541407567
1993-01-01	65.9898951715504
1993-04-01	67.4843348824787
1993-07-01	65.2843551775747
1993-10-01	64.8230301474481
1994-01-01	65.0317296133740
1994-04-01	66.3909720620631
1994-07-01	66.7562832226325
1994-10-01	64.5727939813811
1995-01-01	65.3128779430474
1995-04-01	66.7705561345297
1995-07-01	66.5962504843141
1995-10-01	65.4888048851410
1996-01-01	65.4684076937182
1996-04-01	66.4895324232541
1996-07-01	66.9113101856548
1996-10-01	65.4909740962661
1997-01-01	66.1781424311957
1997-04-01	66.2020840066758
1997-07-01	64.3529429481436
1997-10-01	64.9160534333255
1998-01-01	65.4985607132590
1998-04-01	65.4534376782089
1998-07-01	64.9399282836124
1998-10-01	63.6841969750471
1999-01-01	64.7224072677760
1999-04-01	65.2276203656494
1999-07-01	64.3766138457775
1999-10-01	63.0213855530311
2000-01-01	64.0579590473951
2000-04-01	64.8405758778779
2000-07-01	64.6187619428521
2000-10-01	64.2093129333725
2001-01-01	65.4373526617642
2001-04-01	65.6116621791483
2001-07-01	65.0042667316835
2001-10-01	64.1418322773738
2002-01-01	64.7870235690700
2002-04-01	65.6799150438591
2002-07-01	65.4418536432289
2002-10-01	64.0625503679084
2003-01-01	63.2889164516602
2003-04-01	63.5536274690788
2003-07-01	64.2474829761457
2003-10-01	62.6981911938652
2004-01-01	62.4146482093678
2004-04-01	62.4569852645273
2004-07-01	62.3334548384935
2004-10-01	60.2270234967857
2005-01-01	60.5412075604742
2005-04-01	60.6004821107310
2005-07-01	61.1618746654787
2005-10-01	60.6714609165453
2006-01-01	60.8891279816521
2006-04-01	61.3097849065627
2006-07-01	62.3046176833093
2006-10-01	61.5254154557398
2007-01-01	60.8754512917494
2007-04-01	61.5998190856260
2007-07-01	61.3422535855244
2007-10-01	59.7381972599433
2008-01-01	59.2579686281334
2008-04-01	59.1765495246110
2008-07-01	59.6720368739360
2008-10-01	58.4123153486498
2009-01-01	58.8862035342238
2009-04-01	58.8616437130646
2009-07-01	59.0752698011021
2009-10-01	58.0322191469732
2010-01-01	55.6550776872836
2010-04-01	55.3440783076814
2010-07-01	54.2709479264340
2010-10-01	53.4025059249811
2011-01-01	53.3998938861416
2011-04-01	52.5208010256680
2011-07-01	52.5217052278758
2011-10-01	52.1739949621290
2012-01-01	52.2821127411343
2012-04-01	52.6871366596576
2012-07-01	52.3028445104068
2012-10-01	52.3342521033502
2013-01-01	52.3889685257369
2013-04-01	52.2513201439619
2013-07-01	52.7984159332410
2013-10-01	51.6975136255396
2014-01-01	51.5179204417530
2014-04-01	52.0063820849798
2014-07-01	51.5142946809394
2014-10-01	51.3097875738204
2015-01-01	52.2999152314994
2015-04-01	51.8076858839302
2015-07-01	51.6810146313449
2015-10-01	51.2890798228506
2016-01-01	52.3765170744380
2016-04-01	51.9737868401348
2016-07-01	51.9468859162504
2016-10-01	51.5773900623001
2017-01-01	52.2902486884973
2017-04-01	51.7353042692061
2017-07-01	51.1821053773756
2017-10-01	50.6621136216977
2018-01-01	50.7271632007052
2018-04-01	50.9135044312403
2018-07-01	51.4500228069308