Quarter	Percent
1986-01-01	64.4982272236781
1986-04-01	65.3355859315005
1986-07-01	65.4381403884386
1986-10-01	65.2940282631819
1987-01-01	65.4136473429952
1987-04-01	66.6165865384615
1987-07-01	66.9258373205742
1987-10-01	67.4442793462110
1988-01-01	65.3755174452986
1988-04-01	66.2982611258473
1988-07-01	65.5947136563877
1988-10-01	65.7560262965668
1989-01-01	64.5766656968286
1989-04-01	63.9727219965177
1989-07-01	64.9414486048865
1989-10-01	64.9712643678161
1990-01-01	64.5437669570184
1990-04-01	65.6001137656428
1990-07-01	65.1478703834725
1990-10-01	65.4721753794266
1991-01-01	64.6319318340550
1991-04-01	64.8122392211405
1991-07-01	64.4884397064932
1991-10-01	64.1135142581623
1992-01-01	63.9479095270733
1992-04-01	64.9822452881726
1992-07-01	64.4130050333288
1992-10-01	64.8849797023004
1993-01-01	64.0742734122712
1993-04-01	64.5774742199009
1993-07-01	65.0139944022391
1993-10-01	65.6419769444813
1994-01-01	65.4160084254871
1994-04-01	66.4309102815979
1994-07-01	66.5407166123778
1994-10-01	67.4605229096557
1995-01-01	67.0438472418670
1995-04-01	67.6903390914907
1995-07-01	68.4779842199033
1995-10-01	68.1749241658241
1996-01-01	68.2651267888526
1996-04-01	69.1174634877044
1996-07-01	69.9118340990935
1996-10-01	69.2981374121130
1997-01-01	67.7292790583619
1997-04-01	68.4294088910601
1997-07-01	68.7834549878346
1997-10-01	68.2923877526322
1998-01-01	67.7069526448970
1998-04-01	66.7827967323402
1998-07-01	67.7407762338284
1998-10-01	68.0716417910448
1999-01-01	68.1866888915347
1999-04-01	68.8666904507076
1999-07-01	69.4207027540361
1999-10-01	70.0982132292036
2000-01-01	69.5867768595041
2000-04-01	68.8975448536355
2000-07-01	70.2607054382446
2000-10-01	70.9422850412250
2001-01-01	70.4892966360856
2001-04-01	70.6817379018015
2001-07-01	70.8941176470588
2001-10-01	72.1186540039864
2002-01-01	71.3601308716990
2002-04-01	70.5806902985075
2002-07-01	71.3255813953488
2002-10-01	72.4936327853670
2003-01-01	70.8818443804035
2003-04-01	71.0904285878433
2003-07-01	72.0632012823449
2003-10-01	72.2298221614227
2004-01-01	71.5502555366269
2004-04-01	71.3945847966466
2004-07-01	72.5505706859532
2004-10-01	73.4654803468859
2005-01-01	72.8712648842957
2005-04-01	73.7745372966910
2005-07-01	74.1910200425484
2005-10-01	73.5819562304600
2006-01-01	73.5811261963054
2006-04-01	74.5753302986566
2006-07-01	74.4260840634357
2006-10-01	73.2750995134896
2007-01-01	73.8967343336275
2007-04-01	74.4129643920185
2007-07-01	73.5955056179775
2007-10-01	74.9835056080932
2008-01-01	72.9219281871088
2008-04-01	74.9341527655838
2008-07-01	75.6143045195261
2008-10-01	75.6736035049288
2009-01-01	74.5460511922993
2009-04-01	74.4425010931351
2009-07-01	73.5589519650655
2009-10-01	73.7117333042815
2010-01-01	72.6343267348271
2010-04-01	72.5473134653034
2010-07-01	72.4978241949521
2010-10-01	72.7796499619524
2011-01-01	73.1768286055864
2011-04-01	73.6481340441736
2011-07-01	73.0530443306829
2011-10-01	74.0821440244035
2012-01-01	72.9482288828338
2012-04-01	73.1449148843300
2012-07-01	73.0092845439650
2012-10-01	73.2197466142420
2013-01-01	73.2700283780834
2013-04-01	73.1797838663901
2013-07-01	74.5091623036649
2013-10-01	75.0489875898106
2014-01-01	74.7474747474748
2014-04-01	74.1704619388419
2014-07-01	75.2785892026398
2014-10-01	75.3313934691238
2015-01-01	75.3948640807994
2015-04-01	74.6145610278372
2015-07-01	74.6370623398804
2015-10-01	75.3054935713527
2016-01-01	75.4806676526516
2016-04-01	76.5997688347168
2016-07-01	77.3345896147404
2016-10-01	78.0218636127017
2017-01-01	77.5051759834369
2017-04-01	77.5383981032883
2017-07-01	78.7144470684875
2017-10-01	78.8866189989786
2018-01-01	78.2710280373832
2018-04-01	79.0080971659919
2018-07-01	79.1927346115035