Quarter	Percent
1978-04-01	56.2346233678642
1978-07-01	56.4850093473227
1978-10-01	56.2834321989440
1979-01-01	56.7031372702968
1979-04-01	56.6517869868608
1979-07-01	56.6414117918884
1979-10-01	55.6766578913032
1980-01-01	55.7487213560515
1980-04-01	55.2673594076954
1980-07-01	54.8903019934125
1980-10-01	55.0376968921959
1981-01-01	55.6584356789886
1981-04-01	55.2984487513102
1981-07-01	55.1415927138767
1981-10-01	54.9227642327104
1982-01-01	55.3098220469259
1982-04-01	55.3996312532800
1982-07-01	55.6595816596739
1982-10-01	55.0653310496830
1983-01-01	55.4956506770859
1983-04-01	55.4195161424243
1983-07-01	55.3920945797666
1983-10-01	55.0547549681408
1984-01-01	55.2445288888411
1984-04-01	54.4918729395788
1984-07-01	54.7871263775267
1984-10-01	54.2861043895129
1985-01-01	54.2559075974900
1985-04-01	54.0636823426714
1985-07-01	53.7349190666136
1985-10-01	52.8449524475955
1986-01-01	52.4950362837669
1986-04-01	51.4744888465808
1986-07-01	51.6846762200944
1986-10-01	51.1782329314776
1987-01-01	51.3259374480294
1987-04-01	50.9661668603676
1987-07-01	51.2296365406592
1987-10-01	50.7375599797522
1988-01-01	50.4837149989748
1988-04-01	49.9798070128542
1988-07-01	50.3429750857617
1988-10-01	49.7497423605093
1989-01-01	49.5649518712591
1989-04-01	48.7591239202991
1989-07-01	48.6523790565733
1989-10-01	48.1266676722054
1990-01-01	48.2404763396501
1990-04-01	47.5825468861641
1990-07-01	47.6125538900004
1990-10-01	47.5890296874498
1991-01-01	48.0618116814701
1991-04-01	47.6434129802331
1991-07-01	48.1665034150041
1991-10-01	48.2129568694297
1992-01-01	48.1003911171581
1992-04-01	48.1020247505259
1992-07-01	47.9886634118090
1992-10-01	48.0490555166729
1993-01-01	48.4044281604018
1993-04-01	48.8023900790861
1993-07-01	48.4158064807492
1993-10-01	47.5745763831139
1994-01-01	47.7285295998801
1994-04-01	47.6603237216966
1994-07-01	47.1942072397253
1994-10-01	47.0369143412526
1995-01-01	46.9907842685604
1995-04-01	46.4394651652740
1995-07-01	46.3436500517743
1995-10-01	45.8289864203613
1996-01-01	46.2529425342328
1996-04-01	46.3283239456130
1996-07-01	46.1433384168195
1996-10-01	46.1139413385556
1997-01-01	46.2931421083885
1997-04-01	46.4411600617235
1997-07-01	46.5521429005963
1997-10-01	46.3859455978579
1998-01-01	46.7969651966246
1998-04-01	46.3851751002479
1998-07-01	46.1422567724482
1998-10-01	46.1275156203095
1999-01-01	46.7271427410481
1999-04-01	46.5911401731146
1999-07-01	46.4044144235265
1999-10-01	45.7681583121992
2000-01-01	46.0448997978533
2000-04-01	45.4011470439561
2000-07-01	45.0648622938749
2000-10-01	45.4586306635510
2001-01-01	45.5284850672099
2001-04-01	44.5938121301380
2001-07-01	44.9323665028122
2001-10-01	44.7504896528253
2002-01-01	44.9440868803825
2002-04-01	45.1504432168388
2002-07-01	44.7501880320636
2002-10-01	44.1936823088220
2003-01-01	43.8202796460788
2003-04-01	43.9311345174680
2003-07-01	44.2982159698745
2003-10-01	44.2912011685307
2004-01-01	44.6413162704094
2004-04-01	44.4408904725149
2004-07-01	44.3676053473610
2004-10-01	43.8054729304101
2005-01-01	43.3734554259962
2005-04-01	43.0068389430093
2005-07-01	42.9718441953850
2005-10-01	42.7721594291775
2006-01-01	42.9348900421689
2006-04-01	42.4778984912526
2006-07-01	42.3042604721410
2006-10-01	42.2093847353029
2007-01-01	42.2193936926644
2007-04-01	42.0730254124059
2007-07-01	41.9314074982789
2007-10-01	41.5015358820390
2008-01-01	41.6860891118573
2008-04-01	41.3583600252199
2008-07-01	41.4164544226355
2008-10-01	41.3486267453214
2009-01-01	41.0349585406247
2009-04-01	41.0947998512802
2009-07-01	41.5440170370439
2009-10-01	41.3393154839226
2010-01-01	41.6329399893810
2010-04-01	41.5556701607506
2010-07-01	41.4193532804570
2010-10-01	40.9425437198807
2011-01-01	41.2006472369385
2011-04-01	41.1261689661199
2011-07-01	41.1131537063531
2011-10-01	41.1040775911354
2012-01-01	41.2955314895089
2012-04-01	41.0625485346380
2012-07-01	41.3046850990290
2012-10-01	41.2509555829234
2013-01-01	41.2316796998904
2013-04-01	41.0695998429606
2013-07-01	41.4410582136317
2013-10-01	41.4955617786513
2014-01-01	41.3681887370780
2014-04-01	41.2516490684886
2014-07-01	41.3304654665867
2014-10-01	41.3762975348047
2015-01-01	41.2182344711552
2015-04-01	40.9948119263091
2015-07-01	40.9763836583008
2015-10-01	40.3090629595603
2016-01-01	40.5438504460786
2016-04-01	40.3997788923252
2016-07-01	40.9621194471099
2016-10-01	40.6837922800124
2017-01-01	40.5828252728740
2017-04-01	40.2216204987017
2017-07-01	40.2435872623421
2017-10-01	39.5481161566365
2018-01-01	39.4202184453586
2018-04-01	39.3231749426468
2018-07-01	39.8351041672703