Quarter	Percent
1978-04-01	49.3590632726090
1978-07-01	49.6228029396401
1978-10-01	49.3884023231270
1979-01-01	49.7544642007339
1979-04-01	49.6301919174787
1979-07-01	49.6378838928879
1979-10-01	48.5399315214916
1980-01-01	48.5901948251170
1980-04-01	48.0423724266190
1980-07-01	47.6090302032460
1980-10-01	47.6774732763833
1981-01-01	48.3763175622244
1981-04-01	47.9245754287664
1981-07-01	47.7324359766858
1981-10-01	47.4763827868910
1982-01-01	47.8614494782266
1982-04-01	47.9692649413823
1982-07-01	48.2632774360665
1982-10-01	47.5053215040840
1983-01-01	48.0068329997451
1983-04-01	47.8979943681484
1983-07-01	47.8280437728737
1983-10-01	47.3943539718732
1984-01-01	47.5475578343639
1984-04-01	46.6850184461063
1984-07-01	47.0510255854559
1984-10-01	46.4086870324402
1985-01-01	46.2941901451807
1985-04-01	46.0351244586240
1985-07-01	45.6719476675575
1985-10-01	44.6283964396567
1986-01-01	44.1773414777442
1986-04-01	42.9419353143153
1986-07-01	43.1038842279154
1986-10-01	42.4901307713401
1987-01-01	42.6802487624836
1987-04-01	42.2030112044789
1987-07-01	42.5158438033328
1987-10-01	41.9377517040729
1988-01-01	41.6262832674249
1988-04-01	40.9529419647189
1988-07-01	41.3462445016231
1988-10-01	40.6220529743395
1989-01-01	40.3751019784694
1989-04-01	39.3902210918714
1989-07-01	39.2776056959145
1989-10-01	38.6107827282104
1990-01-01	38.7013466576038
1990-04-01	37.9395284570834
1990-07-01	37.9977712578550
1990-10-01	37.9710668481652
1991-01-01	38.4495140114885
1991-04-01	37.9126676417542
1991-07-01	38.5033892904503
1991-10-01	38.5631311730455
1992-01-01	38.3591417450098
1992-04-01	38.3015144384398
1992-07-01	38.1303905623091
1992-10-01	38.1298245188783
1993-01-01	38.4707550462722
1993-04-01	38.9408346710838
1993-07-01	38.5141183421709
1993-10-01	37.5058473019119
1994-01-01	37.6568645225293
1994-04-01	37.5507127373222
1994-07-01	36.9543280047762
1994-10-01	36.7419111290958
1995-01-01	36.6818204254036
1995-04-01	36.0261448879531
1995-07-01	35.9294830951884
1995-10-01	35.2924157967128
1996-01-01	35.7438518598422
1996-04-01	35.8612501691805
1996-07-01	35.6351488160969
1996-10-01	35.5850550983803
1997-01-01	35.7708847264605
1997-04-01	35.9633346415655
1997-07-01	36.1167538814451
1997-10-01	35.9386240433099
1998-01-01	36.3808677667342
1998-04-01	35.9022345081079
1998-07-01	35.6159220521686
1998-10-01	35.5302691033488
1999-01-01	36.2484594726991
1999-04-01	36.0755118362022
1999-07-01	35.8560423308022
1999-10-01	35.1697073212910
2000-01-01	35.4519313922001
2000-04-01	34.6383786666468
2000-07-01	34.2002885905315
2000-10-01	34.6800891754624
2001-01-01	34.7819260202968
2001-04-01	33.6041699436793
2001-07-01	34.0401348822960
2001-10-01	33.8275247556429
2002-01-01	34.0820404264385
2002-04-01	34.3278833823726
2002-07-01	33.8148105764753
2002-10-01	33.1569190097452
2003-01-01	32.6982381656154
2003-04-01	32.8210592926127
2003-07-01	33.2174341577570
2003-10-01	33.1761702840818
2004-01-01	33.5913991853965
2004-04-01	33.4043983464003
2004-07-01	33.3587749726759
2004-10-01	32.7023782797250
2005-01-01	32.2090758862427
2005-04-01	31.7618019316057
2005-07-01	31.7518650763294
2005-10-01	31.5217886064751
2006-01-01	31.6364049607224
2006-04-01	31.1157982761412
2006-07-01	30.9495550831891
2006-10-01	30.8205778116967
2007-01-01	30.8575934853810
2007-04-01	30.7270834765082
2007-07-01	30.6170693902373
2007-10-01	30.1072925003360
2008-01-01	30.3040128430944
2008-04-01	29.9179310726004
2008-07-01	30.0556276542092
2008-10-01	29.9035393512680
2009-01-01	29.5120893901207
2009-04-01	29.6465316794278
2009-07-01	30.2686203411450
2009-10-01	29.9781702258263
2010-01-01	30.3115661433478
2010-04-01	30.2733574818355
2010-07-01	30.0206466273980
2010-10-01	29.5139236407517
2011-01-01	29.6654695779025
2011-04-01	29.5728431373559
2011-07-01	29.4608451132170
2011-10-01	29.4867042971666
2012-01-01	29.6547895241700
2012-04-01	29.4471851802153
2012-07-01	29.7204689700417
2012-10-01	29.6040623387152
2013-01-01	29.4906696769643
2013-04-01	29.3158692549254
2013-07-01	29.7018420338058
2013-10-01	29.6724570861813
2014-01-01	29.4763575535739
2014-04-01	29.4240284099487
2014-07-01	29.5102090397984
2014-10-01	29.4021001701091
2015-01-01	29.1557485257182
2015-04-01	28.8252323879592
2015-07-01	28.8725889269894
2015-10-01	28.0969533379299
2016-01-01	28.2934809241486
2016-04-01	28.1062750281495
2016-07-01	28.7229939060835
2016-10-01	28.3250188578459
2017-01-01	28.1976907815208
2017-04-01	27.7128714226504
2017-07-01	27.7498036214929
2017-10-01	26.9033145561296
2018-01-01	26.7212851958254
2018-04-01	26.5988991973573
2018-07-01	27.1332861278559