Quarter	Percent
1978-04-01	73.6994497138755
1978-07-01	73.5088560819298
1978-10-01	73.7188839741028
1979-01-01	72.9781672350069
1979-04-01	73.5933809618754
1979-07-01	73.5943386198422
1979-10-01	74.1197653283596
1980-01-01	73.5373245363194
1980-04-01	74.0107582355010
1980-07-01	74.3940864859418
1980-10-01	74.1976528576060
1981-01-01	73.5706990814556
1981-04-01	74.2972153470834
1981-07-01	74.4996300920973
1981-10-01	74.4496863726351
1982-01-01	73.8560499827955
1982-04-01	74.2522746621528
1982-07-01	74.4611351796695
1982-10-01	74.6077168091880
1983-01-01	73.8253031392164
1983-04-01	74.2274436970488
1983-07-01	74.4878862981004
1983-10-01	74.3259804196029
1984-01-01	74.0758859225919
1984-04-01	75.0507093284767
1984-07-01	75.0364804933531
1984-10-01	75.1859908251200
1985-01-01	74.8297679581450
1985-04-01	75.2793889037536
1985-07-01	75.7549548632263
1985-10-01	76.2768468386274
1986-01-01	76.2327817574545
1986-04-01	77.3017623319237
1986-07-01	77.5945449424974
1986-10-01	77.5958173791930
1987-01-01	77.0247728031250
1987-04-01	77.8073852249287
1987-07-01	77.8322334036200
1987-10-01	77.6185887271996
1988-01-01	77.6579478462694
1988-04-01	78.7033027190319
1988-07-01	78.2954576928272
1988-10-01	78.6523199307458
1989-01-01	78.0453726503006
1989-04-01	79.3021285304856
1989-07-01	79.4780396743744
1989-10-01	79.8876788156846
1990-01-01	79.5292924887416
1990-04-01	80.4958847782900
1990-07-01	80.3375132239450
1990-10-01	80.0702009645500
1991-01-01	79.7719420696663
1991-04-01	80.6331780679551
1991-07-01	80.2647411049592
1991-10-01	79.8354515609851
1992-01-01	79.7089309017081
1992-04-01	80.0166627570719
1992-07-01	80.0291965748214
1992-10-01	79.8573436021040
1993-01-01	79.3602537412844
1993-04-01	79.5810837699812
1993-07-01	79.8062254514248
1993-10-01	80.1300025742898
1994-01-01	79.2110222653362
1994-04-01	79.6255763305616
1994-07-01	80.0967810289713
1994-10-01	79.8249969831476
1995-01-01	79.6598830985354
1995-04-01	80.3771344996336
1995-07-01	80.6922365387613
1995-10-01	80.7795059506691
1996-01-01	80.1985874796127
1996-04-01	80.2224621222141
1996-07-01	80.4734249057932
1996-10-01	80.3027232847479
1997-01-01	80.0521460939810
1997-04-01	80.2070606126430
1997-07-01	80.3070878694607
1997-10-01	80.1003938371666
1998-01-01	79.5810939134651
1998-04-01	80.0580024977147
1998-07-01	80.3358410034866
1998-10-01	80.1074320964760
1999-01-01	79.4724472491342
1999-04-01	79.8435176298646
1999-07-01	79.9972488402279
1999-10-01	80.0829848468873
2000-01-01	79.5786997139436
2000-04-01	80.4168360647307
2000-07-01	80.8179963306666
2000-10-01	80.2964363989348
2001-01-01	79.8747721648251
2001-04-01	80.9021751176972
2001-07-01	80.7831368487456
2001-10-01	80.6518213548166
2002-01-01	80.3717131420482
2002-04-01	80.7325740158171
2002-07-01	80.9702735316371
2002-10-01	81.1136509696470
2003-01-01	81.2379084326146
2003-04-01	81.2929146577156
2003-07-01	81.0168829168210
2003-10-01	80.8429197260442
2004-01-01	80.4502162366472
2004-04-01	80.7826633797080
2004-07-01	80.8317421189971
2004-10-01	81.1136101239258
2005-01-01	81.3968595935683
2005-04-01	82.1136795294685
2005-07-01	82.1566658182289
2005-10-01	82.0498177952409
2006-01-01	81.7285102645848
2006-04-01	82.2764574202425
2006-07-01	82.4709107205359
2006-10-01	82.3735826259176
2007-01-01	82.2436180961490
2007-04-01	82.6618048080121
2007-07-01	82.9327886026527
2007-10-01	83.0740132770438
2008-01-01	82.8345001292281
2008-04-01	83.1936632853234
2008-07-01	83.1502268034302
2008-10-01	83.2514066225642
2009-01-01	82.9708426503116
2009-04-01	83.2014479156424
2009-07-01	82.9049471336184
2009-10-01	82.5682622876706
2010-01-01	82.3083677249132
2010-04-01	82.6525644760030
2010-07-01	83.0149931476423
2010-10-01	83.2640416545182
2011-01-01	82.9127569368204
2011-04-01	83.1575069651278
2011-07-01	83.1442073736827
2011-10-01	83.0766509337998
2012-01-01	82.6473634322438
2012-04-01	82.8487242490721
2012-07-01	82.9061913170419
2012-10-01	82.8226018359956
2013-01-01	82.8243585219812
2013-04-01	83.1420800692838
2013-07-01	82.8416206783834
2013-10-01	82.8748996698656
2014-01-01	82.7412452644088
2014-04-01	82.8718410258877
2014-07-01	82.8177091627562
2014-10-01	82.7890269325039
2015-01-01	83.1667479712333
2015-04-01	83.4039816134942
2015-07-01	83.4360603002594
2015-10-01	83.4539593715442
2016-01-01	83.4091408163734
2016-04-01	83.4896970101922
2016-07-01	83.2978985180930
2016-10-01	83.5601670534027
2017-01-01	83.4008106283813
2017-04-01	83.9905565389494
2017-07-01	83.8371443419832
2017-10-01	84.4708489339092
2018-01-01	84.3863424138727
2018-04-01	84.6416027003396
2018-07-01	84.2311919046950