Quarter	Percent
1986-01-01	76.8020969855832
1986-04-01	74.1914191419142
1986-07-01	72.7061170212766
1986-10-01	73.8825883922615
1987-01-01	74.7157190635452
1987-04-01	71.5053763440860
1987-07-01	71.3803577455282
1987-10-01	72.6657645466847
1988-01-01	68.8730482009504
1988-04-01	66.5300546448087
1988-07-01	64.4452078323600
1988-10-01	65.2518978605935
1989-01-01	65.3018736988203
1989-04-01	61.5572625698324
1989-07-01	60.5124605124605
1989-10-01	64.5444952514949
1990-01-01	62.6760563380282
1990-04-01	61.5194346289753
1990-07-01	59.6951435661113
1990-10-01	61.7511520737327
1991-01-01	59.0570719602978
1991-04-01	55.7644554806669
1991-07-01	53.4825870646766
1991-10-01	56.4877355136864
1992-01-01	56.1322431567721
1992-04-01	54.0377090003558
1992-07-01	52.9600570613409
1992-10-01	56.3616869192280
1993-01-01	55.4561717352415
1993-04-01	54.1577060931900
1993-07-01	54.8920863309352
1993-10-01	57.6784426820476
1994-01-01	57.7978339350180
1994-04-01	56.6160520607375
1994-07-01	59.7101449275362
1994-10-01	60.9074410163339
1995-01-01	62.8405375953505
1995-04-01	61.1777535441658
1995-07-01	61.0989810771470
1995-10-01	64.6159446669094
1996-01-01	61.7625637290604
1996-04-01	60.8014571948998
1996-07-01	61.1760409057706
1996-10-01	62.2482607103625
1997-01-01	61.6654438738078
1997-04-01	58.5940375414060
1997-07-01	58.6257850018471
1997-10-01	61.3417346182357
1998-01-01	59.9628252788104
1998-04-01	56.4600448095594
1998-07-01	55.4347826086956
1998-10-01	55.9608875517112
1999-01-01	56.1886792452830
1999-04-01	53.7500000000000
1999-07-01	55.9726962457338
1999-10-01	60.1366742596811
2000-01-01	57.6908469426510
2000-04-01	53.6094224924012
2000-07-01	54.7284466388150
2000-10-01	58.9082638362396
2001-01-01	58.5919757759273
2001-04-01	55.7859027516020
2001-07-01	58.0149812734082
2001-10-01	59.6804162021553
2002-01-01	62.2745675377254
2002-04-01	56.6642388929352
2002-07-01	56.0966810966811
2002-10-01	60.3645461043603
2003-01-01	59.1663723066054
2003-04-01	56.9580419580420
2003-07-01	57.9221681723419
2003-10-01	60.0552868002764
2004-01-01	60.8934707903780
2004-04-01	58.3989052343483
2004-07-01	57.6398362892224
2004-10-01	62.3385452073420
2005-01-01	60.0067727734507
2005-04-01	58.5415259959487
2005-07-01	57.6767676767677
2005-10-01	61.2470667113644
2006-01-01	62.5959292625959
2006-04-01	60.3855101362579
2006-07-01	58.4549071618037
2006-10-01	62.2929092113983
2007-01-01	60.4435617345250
2007-04-01	59.2445328031809
2007-07-01	59.5751742449386
2007-10-01	62.0643876535015
2008-01-01	58.1148357119150
2008-04-01	58.0484566876867
2008-07-01	56.3992042440318
2008-10-01	59.7944978455419
2009-01-01	56.2686073436983
2009-04-01	54.6684262619598
2009-07-01	49.7862545215390
2009-10-01	53.3245987553226
2010-01-01	51.8264840182648
2010-04-01	49.5773732119636
2010-07-01	50.2755267423015
2010-10-01	52.6808785529716
2011-01-01	52.0437721274541
2011-04-01	49.5822622107969
2011-07-01	49.3264913406030
2011-10-01	51.7285531370038
2012-01-01	51.7109050207867
2012-04-01	50.4156010230179
2012-07-01	49.6166134185304
2012-10-01	49.4740197641058
2013-01-01	50.4770992366412
2013-04-01	49.0488268864933
2013-07-01	49.7316071992422
2013-10-01	54.2857142857143
2014-01-01	53.8509510445900
2014-04-01	52.5696594427245
2014-07-01	52.7479275406816
2014-10-01	56.6169759659264
2015-01-01	56.9658507101844
2015-04-01	54.2925516003590
2015-07-01	52.4858588865734
2015-10-01	56.1076604554865
2016-01-01	56.8995889606577
2016-04-01	55.4846198491004
2016-07-01	55.0347222222222
2016-10-01	58.4344309647602
2017-01-01	59.8559077809798
2017-04-01	54.7838616714697
2017-07-01	55.6451612903226
2017-10-01	59.0371865090804
2018-01-01	58.6117511520737
2018-04-01	56.4841498559078
2018-07-01	55.4881571346043