Quarter	Percent
1986-01-01	63.1488824801730
1986-04-01	62.9179057402902
1986-07-01	62.9142651296830
1986-10-01	63.5931046866583
1987-01-01	63.4947632262107
1987-04-01	63.6770097469373
1987-07-01	63.1630648330059
1987-10-01	64.2265562383115
1988-01-01	63.3010399075638
1988-04-01	62.9955555555556
1988-07-01	62.5166622234071
1988-10-01	62.8026607538803
1989-01-01	61.9330262225372
1989-04-01	61.1839773130096
1989-07-01	61.2168984146666
1989-10-01	62.3576158940397
1990-01-01	62.4801971483894
1990-04-01	63.1338430442042
1990-07-01	62.7258375723557
1990-10-01	63.5974491133048
1991-01-01	63.7946040034813
1991-04-01	63.5313531353135
1991-07-01	63.1533327554824
1991-10-01	63.3134560539279
1992-01-01	63.4514266011551
1992-04-01	63.2122568428301
1992-07-01	62.5300790649708
1992-10-01	64.0188517566410
1993-01-01	63.0819168019134
1993-04-01	62.9613843662092
1993-07-01	63.1677441306567
1993-10-01	64.0278013222580
1994-01-01	64.6457823186693
1994-04-01	63.8851465139778
1994-07-01	64.0691913678730
1994-10-01	65.6409398779162
1995-01-01	65.0070768462243
1995-04-01	65.2885014528850
1995-07-01	65.5606123293339
1995-10-01	66.5074528534958
1996-01-01	66.6748627161708
1996-04-01	67.1920940868997
1996-07-01	67.7437734006186
1996-10-01	66.7530784186649
1997-01-01	67.1344463263166
1997-04-01	66.8221668141237
1997-07-01	66.8939515482111
1997-10-01	66.8745003996803
1998-01-01	66.9163943572169
1998-04-01	66.4704010184596
1998-07-01	66.4760543245175
1998-10-01	67.1233961666403
1999-01-01	67.1381163084703
1999-04-01	66.7771726260952
1999-07-01	66.7717279962178
1999-10-01	67.5255302435192
2000-01-01	67.2230057984642
2000-04-01	66.3353162179086
2000-07-01	67.0782214581543
2000-10-01	68.0744954414400
2001-01-01	67.6664853523972
2001-04-01	67.8909768597608
2001-07-01	67.6782534644267
2001-10-01	69.3711030713571
2002-01-01	68.9335985312118
2002-04-01	68.6334221545489
2002-07-01	68.4716752499243
2002-10-01	69.1746294484990
2003-01-01	68.6491332934848
2003-04-01	68.3060921248143
2003-07-01	69.1301455916045
2003-10-01	69.8045267489712
2004-01-01	69.3303114490423
2004-04-01	67.9630034229116
2004-07-01	68.8796981570164
2004-10-01	70.6413404593384
2005-01-01	69.8913903474070
2005-04-01	69.5733237719613
2005-07-01	70.7749499571061
2005-10-01	71.2688692680148
2006-01-01	71.5156670920176
2006-04-01	71.0470538363714
2006-07-01	70.6753136895531
2006-10-01	70.6667603456756
2007-01-01	71.7808603054504
2007-04-01	71.4085788258344
2007-07-01	70.5791937399567
2007-10-01	71.9640493276667
2008-01-01	70.5976372480889
2008-04-01	71.3106223548186
2008-07-01	71.7719589914104
2008-10-01	72.6990049751244
2009-01-01	71.7102088646860
2009-04-01	71.3332416070446
2009-07-01	71.0923562508577
2009-10-01	71.9365426695842
2010-01-01	71.5639487319335
2010-04-01	70.9558823529412
2010-07-01	70.8322001631765
2010-10-01	71.5739484396201
2011-01-01	71.9422998780984
2011-04-01	71.4208353076559
2011-07-01	71.1801326295845
2011-10-01	72.0273102142905
2012-01-01	72.2192188133532
2012-04-01	71.9548465594160
2012-07-01	71.9064675272014
2012-10-01	71.1469655032741
2013-01-01	72.3098705501618
2013-04-01	71.8404742656966
2013-07-01	72.3671822461332
2013-10-01	73.5818693844710
2014-01-01	73.8435828877005
2014-04-01	72.5151656556230
2014-07-01	73.3687707641196
2014-10-01	75.1091414208229
2015-01-01	74.5567200580054
2015-04-01	73.6904293028751
2015-07-01	72.8384565075212
2015-10-01	73.6225850517140
2016-01-01	74.3387440988165
2016-04-01	74.5418301073886
2016-07-01	74.4732628882485
2016-10-01	76.3229956059352
2017-01-01	76.3614488348531
2017-04-01	74.8029510057381
2017-07-01	76.2688442211055
2017-10-01	77.2082265424767
2018-01-01	77.0651903458572
2018-04-01	76.4691296801388
2018-07-01	76.6178379380679