Quarter	Percent
1978-04-01	20.9784572357880
1978-07-01	21.7381795443810
1978-10-01	21.4056373054853
1979-01-01	21.1316545294247
1979-04-01	21.5979541593760
1979-07-01	21.9003163395130
1979-10-01	21.5963456973440
1980-01-01	21.3701963127672
1980-04-01	21.7987853963106
1980-07-01	21.8534431181817
1980-10-01	21.6123288574082
1981-01-01	21.3433130034703
1981-04-01	21.9806125632398
1981-07-01	22.0903868199439
1981-10-01	22.3851182310301
1982-01-01	22.0078125682280
1982-04-01	22.8476183449543
1982-07-01	22.9215091142357
1982-10-01	22.4971365195399
1983-01-01	22.6691405045418
1983-04-01	23.3918782440956
1983-07-01	23.5489735145253
1983-10-01	23.5286941151142
1984-01-01	23.1251839479171
1984-04-01	23.6581614647488
1984-07-01	23.9806806024929
1984-10-01	24.2093663807697
1985-01-01	23.8896525897541
1985-04-01	24.4962023909540
1985-07-01	24.3727393746388
1985-10-01	24.2179270560523
1986-01-01	23.7371206721547
1986-04-01	24.1126577193783
1986-07-01	24.4034122802728
1986-10-01	24.2961663865237
1987-01-01	24.1848658943489
1987-04-01	24.6661558688871
1987-07-01	24.8387047614751
1987-10-01	24.9384578927388
1988-01-01	24.3729865083594
1988-04-01	24.6209846454114
1988-07-01	25.2366252473121
1988-10-01	24.8179020794729
1989-01-01	24.5801670859541
1989-04-01	24.6278530925197
1989-07-01	24.6180555544684
1989-10-01	24.3938305215062
1990-01-01	24.4792342907302
1990-04-01	24.4207044536571
1990-07-01	24.3902451108664
1990-10-01	24.3395932465416
1991-01-01	24.6459808886632
1991-04-01	25.2236761566443
1991-07-01	25.8655304396311
1991-10-01	25.6817163286639
1992-01-01	25.4403227058583
1992-04-01	25.9311520213310
1992-07-01	25.9347558498700
1992-10-01	26.1548752525620
1993-01-01	26.0716719648470
1993-04-01	26.7199521671230
1993-07-01	26.7637378314510
1993-10-01	26.2549816895646
1994-01-01	26.0510287717552
1994-04-01	26.6062382480901
1994-07-01	26.5156581425326
1994-10-01	26.3922292668324
1995-01-01	26.0077944944788
1995-04-01	26.3188745407687
1995-07-01	26.2745144772464
1995-10-01	26.1642221670068
1996-01-01	26.0171904450444
1996-04-01	26.5168494315248
1996-07-01	26.5426294010974
1996-10-01	26.6036294533048
1997-01-01	26.4591263808667
1997-04-01	27.1577761185922
1997-07-01	27.3676128930711
1997-10-01	26.9982262285896
1998-01-01	26.9620345188290
1998-04-01	27.3683833566869
1998-07-01	27.3988152659388
1998-10-01	27.4744486556863
1999-01-01	27.5353016746834
1999-04-01	27.8942950744232
1999-07-01	27.8549119366613
1999-10-01	27.7535564734107
2000-01-01	27.8539239596375
2000-04-01	27.9816038501470
2000-07-01	27.8403885348747
2000-10-01	27.9450643278178
2001-01-01	28.2342626338075
2001-04-01	28.1653846885950
2001-07-01	28.1590280971599
2001-10-01	27.9893214090226
2002-01-01	27.9081241608284
2002-04-01	28.1877898426444
2002-07-01	28.4866606929853
2002-10-01	28.2549970894267
2003-01-01	27.9730312729144
2003-04-01	28.6274740757829
2003-07-01	28.8484158595158
2003-10-01	28.3848162306505
2004-01-01	28.3313328773965
2004-04-01	28.4959225583597
2004-07-01	28.7591014177587
2004-10-01	28.3677794332258
2005-01-01	28.0290850014768
2005-04-01	27.8441649310014
2005-07-01	27.9297715297958
2005-10-01	27.8494989267033
2006-01-01	27.7625462190493
2006-04-01	27.9178409197395
2006-07-01	27.7116854960388
2006-10-01	27.6592002424894
2007-01-01	27.6000084136735
2007-04-01	27.5068897033837
2007-07-01	27.5796305776684
2007-10-01	27.2742942735538
2008-01-01	27.2255183319054
2008-04-01	27.3010601603811
2008-07-01	27.5406827463145
2008-10-01	27.4522017121903
2009-01-01	27.4173522609481
2009-04-01	27.6360296288123
2009-07-01	27.9484785120390
2009-10-01	27.7785873388023
2010-01-01	27.5912563677082
2010-04-01	27.8171805981698
2010-07-01	27.8360535346389
2010-10-01	27.3127798712422
2011-01-01	27.3747709982252
2011-04-01	27.9491800548342
2011-07-01	28.0494966329582
2011-10-01	27.9340392141791
2012-01-01	28.0407713166416
2012-04-01	28.2736344070615
2012-07-01	28.5054980763535
2012-10-01	28.2683608420466
2013-01-01	28.2618835635809
2013-04-01	28.3878907639210
2013-07-01	28.8765092223832
2013-10-01	28.9045096781703
2014-01-01	28.8848370143078
2014-04-01	29.0672654647979
2014-07-01	29.2372627454901
2014-10-01	28.9811311251855
2015-01-01	28.5657984158502
2015-04-01	28.9188496340767
2015-07-01	29.2181515586740
2015-10-01	28.9079965535890
2016-01-01	28.8549156857925
2016-04-01	29.3571806605142
2016-07-01	29.8141644054066
2016-10-01	29.5395359185916
2017-01-01	29.4915147899635
2017-04-01	29.2901355050093
2017-07-01	29.4239492531124
2017-10-01	29.0554188420044
2018-01-01	28.8622955191810
2018-04-01	29.0439059426978
2018-07-01	29.2672390579702