Quarter	Percent
1986-01-01	75.8630087209302
1986-04-01	75.2771719374773
1986-07-01	74.8920895997092
1986-10-01	75.3387411066298
1987-01-01	75.5434045822224
1987-04-01	75.1083423618635
1987-07-01	74.7508904819875
1987-10-01	75.3305153341128
1988-01-01	74.4837493266296
1988-04-01	73.8089892685555
1988-07-01	72.9999102092125
1988-10-01	73.6540099520330
1989-01-01	73.1511758118701
1989-04-01	72.1886065169647
1989-07-01	71.8740199811836
1989-10-01	72.8044313410167
1990-01-01	72.8458832435321
1990-04-01	73.0473438541898
1990-07-01	72.4711623779947
1990-10-01	73.5569698576858
1991-01-01	73.5094671950682
1991-04-01	73.0272407732865
1991-07-01	72.7208945406709
1991-10-01	73.1657192829034
1992-01-01	73.3246130368432
1992-04-01	72.6726726726727
1992-07-01	71.9648909359520
1992-10-01	73.1735852326891
1993-01-01	72.8250539956804
1993-04-01	72.6053970169842
1993-07-01	72.3319137953284
1993-10-01	73.5908097218055
1994-01-01	73.8096254857582
1994-04-01	73.3126091214921
1994-07-01	73.2515181111724
1994-10-01	74.5443011207444
1995-01-01	74.3198854543923
1995-04-01	74.1141897565071
1995-07-01	74.2510460251046
1995-10-01	75.4038974017322
1996-01-01	75.3957073009033
1996-04-01	75.2012882447665
1996-07-01	75.6039343182847
1996-10-01	75.4742491908059
1997-01-01	75.5335210348064
1997-04-01	75.1292384092482
1997-07-01	75.0924083025306
1997-10-01	75.6266450698522
1998-01-01	75.5321297306030
1998-04-01	74.7186251966598
1998-07-01	74.3865586848785
1998-10-01	75.0814135809914
1999-01-01	75.2167282067748
1999-04-01	74.4203770557561
1999-07-01	74.4180455947754
1999-10-01	75.5065339887304
2000-01-01	75.2113574732812
2000-04-01	74.1351825282959
2000-07-01	74.7203757513036
2000-10-01	75.9132782719187
2001-01-01	75.5072119194801
2001-04-01	75.0712701932214
2001-07-01	75.0592136428233
2001-10-01	76.5945754994701
2002-01-01	76.7934464599181
2002-04-01	75.7938048288176
2002-07-01	75.7375656472042
2002-10-01	76.4022097751861
2003-01-01	76.0409920377919
2003-04-01	75.1865742319203
2003-07-01	75.6323745617672
2003-10-01	76.4266966629171
2004-01-01	76.2041562511659
2004-04-01	75.4563366667906
2004-07-01	75.8670520231214
2004-10-01	77.6113345386120
2005-01-01	77.1574536900911
2005-04-01	76.3892961876833
2005-07-01	77.1964461994077
2005-10-01	78.0979092299847
2006-01-01	78.3872020894548
2006-04-01	77.6633047753317
2006-07-01	77.3648892416480
2006-10-01	77.8353296644006
2007-01-01	78.4494511013848
2007-04-01	77.7212286297982
2007-07-01	77.3967208419847
2007-10-01	78.4459362948150
2008-01-01	77.2256064978091
2008-04-01	77.6469332574356
2008-07-01	77.5866969869244
2008-10-01	78.7292132042690
2009-01-01	77.7156803791871
2009-04-01	77.4737882585519
2009-07-01	76.7301799739372
2009-10-01	77.8339476917676
2010-01-01	77.3347801736208
2010-04-01	76.9072092860639
2010-07-01	76.7602682313496
2010-10-01	77.3855161357775
2011-01-01	77.6946628627096
2011-04-01	76.9583971058856
2011-07-01	76.8034782608696
2011-10-01	77.7152191290446
2012-01-01	78.0202216740211
2012-04-01	77.0728315661394
2012-07-01	76.8618315833391
2012-10-01	76.4769214739694
2013-01-01	77.1989456159822
2013-04-01	76.9041513618407
2013-07-01	77.2989797682864
2013-10-01	78.5532120209540
2014-01-01	78.8835868035291
2014-04-01	77.8830693441894
2014-07-01	78.0722973663589
2014-10-01	79.7173647824319
2015-01-01	79.7084331657274
2015-04-01	78.6390492815899
2015-07-01	77.7332130084562
2015-10-01	78.6592253006445
2016-01-01	79.3273039345128
2016-04-01	79.4146533097623
2016-07-01	79.5163445556171
2016-10-01	81.1244329228775
2017-01-01	81.2556371601598
2017-04-01	79.8428983648605
2017-07-01	80.6946971873703
2017-10-01	81.6709021601016
2018-01-01	81.5904208264881
2018-04-01	80.9748576103716
2018-07-01	80.8838288796889