Quarter	Percent
1986-01-01	65.3122317360393
1986-04-01	64.9332476723076
1986-07-01	65.1232385840880
1986-10-01	66.3513513513514
1987-01-01	66.9188681370564
1987-04-01	66.1916820464398
1987-07-01	65.3372617675107
1987-10-01	67.4915863852846
1988-01-01	68.0461896801097
1988-04-01	68.0819949775156
1988-07-01	68.4474616292798
1988-10-01	70.1154023126707
1989-01-01	71.1472588952765
1989-04-01	70.1778398297132
1989-07-01	70.1857540722658
1989-10-01	71.2926249008723
1990-01-01	71.7263488227390
1990-04-01	69.8320977130744
1990-07-01	69.2964561674471
1990-10-01	70.3698109183964
1991-01-01	71.1657594637259
1991-04-01	69.5246226666285
1991-07-01	69.2697029095807
1991-10-01	71.0285629588296
1992-01-01	71.5503981915962
1992-04-01	70.8745284913234
1992-07-01	70.6066030700859
1992-10-01	72.2463210130048
1993-01-01	73.1270517804451
1993-04-01	72.6156369461844
1993-07-01	72.7864294950083
1993-10-01	73.6942120127246
1994-01-01	74.1695372987074
1994-04-01	71.8818408063724
1994-07-01	70.9288546556675
1994-10-01	72.4337804694414
1995-01-01	72.8977625152500
1995-04-01	71.2897387391994
1995-07-01	71.1566692388978
1995-10-01	71.9919817257937
1996-01-01	71.9935674449762
1996-04-01	71.1076115274678
1996-07-01	69.9191869499223
1996-10-01	71.8607072953648
1997-01-01	71.5361968298655
1997-04-01	70.0977934296397
1997-07-01	69.9981129776034
1997-10-01	71.0890918557900
1998-01-01	71.4356419244776
1998-04-01	70.4384244472697
1998-07-01	69.9422332988314
1998-10-01	69.8390067130042
1999-01-01	68.7004269734423
1999-04-01	66.4239615458158
1999-07-01	65.8834827144686
1999-10-01	68.3478381457827
2000-01-01	68.4161652249635
2000-04-01	66.8708914746650
2000-07-01	65.5066801805952
2000-10-01	67.2530193402845
2001-01-01	66.4170233867380
2001-04-01	65.7877476772333
2001-07-01	65.6247635995548
2001-10-01	67.2857836662790
2002-01-01	66.5850808376620
2002-04-01	65.5346846431535
2002-07-01	64.8929904135776
2002-10-01	66.8871579620004
2003-01-01	66.8437214996068
2003-04-01	66.1532082620598
2003-07-01	65.3160658081247
2003-10-01	66.8197984842526
2004-01-01	66.2415698827649
2004-04-01	64.8493516982080
2004-07-01	64.6373841902984
2004-10-01	67.1450279427380
2005-01-01	66.8535136448567
2005-04-01	65.7020756817565
2005-07-01	65.7836322554014
2005-10-01	66.7956940825091
2006-01-01	67.4853573016768
2006-04-01	65.9517073491677
2006-07-01	66.2532733248336
2006-10-01	67.3220387717140
2007-01-01	67.6644214762491
2007-04-01	66.7074334857941
2007-07-01	66.0285131137538
2007-10-01	67.1272108959078
2008-01-01	67.6749827883166
2008-04-01	66.5649945043649
2008-07-01	66.6305200633425
2008-10-01	66.7939119519765
2009-01-01	65.6507480455922
2009-04-01	63.9492184680230
2009-07-01	64.0012529113228
2009-10-01	64.5621588082408
2010-01-01	65.8885630498534
2010-04-01	66.4332246054901
2010-07-01	67.3328157278559
2010-10-01	67.9985721411933
2011-01-01	68.6232138433881
2011-04-01	68.4056751159608
2011-07-01	68.0214076317091
2011-10-01	68.1128963449440
2012-01-01	68.7202224190768
2012-04-01	67.7913223322201
2012-07-01	67.5046092427168
2012-10-01	68.0781839233554
2013-01-01	68.2434986462081
2013-04-01	67.8224946048863
2013-07-01	67.6789798656776
2013-10-01	68.3097356742008
2014-01-01	67.8570999411645
2014-04-01	67.1173099128918
2014-07-01	66.3047500460599
2014-10-01	67.7437841176459
2015-01-01	68.0028225664945
2015-04-01	67.1229316193608
2015-07-01	67.0949520979848
2015-10-01	67.1861084821578
2016-01-01	67.6280989562481
2016-04-01	66.5182282809564
2016-07-01	66.5910226105944
2016-10-01	66.8776570476208
2017-01-01	67.3231256282058
2017-04-01	66.5270066492528
2017-07-01	66.2777510875932
2017-10-01	66.8396456205906
2018-01-01	66.5669181439435
2018-04-01	66.2991934627052
2018-07-01	65.3903622764648