Quarter	Percent
1978-04-01	26.3005502922449
1978-07-01	26.4911439119727
1978-10-01	26.2811160319886
1979-01-01	27.0218327649943
1979-04-01	26.4066190502094
1979-07-01	26.4056613861722
1979-10-01	25.8802346776168
1980-01-01	26.4626754636715
1980-04-01	25.9892417644811
1980-07-01	25.6059135317790
1980-10-01	25.8023471424060
1981-01-01	26.4293009127061
1981-04-01	25.7027846470989
1981-07-01	25.5003698963572
1981-10-01	25.5503136216422
1982-01-01	26.1439500171928
1982-04-01	25.7477253321827
1982-07-01	25.5388648259834
1982-10-01	25.3922831852022
1983-01-01	26.1746968607946
1983-04-01	25.7725562974021
1983-07-01	25.5121137129105
1983-10-01	25.6740195749036
1984-01-01	25.9241140774251
1984-04-01	24.9492906660781
1984-07-01	24.9635195120639
1984-10-01	24.8140091749108
1985-01-01	25.1702320472313
1985-04-01	24.7206111015735
1985-07-01	24.2450451314764
1985-10-01	23.7231531456146
1986-01-01	23.7672182581948
1986-04-01	22.6982376732648
1986-07-01	22.4054550523477
1986-10-01	22.4041826105679
1987-01-01	22.9752272070446
1987-04-01	22.1926147750826
1987-07-01	22.1677665963575
1987-10-01	22.3814112777572
1988-01-01	22.3420521586642
1988-04-01	21.2966972809461
1988-07-01	21.7045423022835
1988-10-01	21.3476800595757
1989-01-01	21.9546273448788
1989-04-01	20.6978714695144
1989-07-01	20.5219603160920
1989-10-01	20.1123211795913
1990-01-01	20.4707075065787
1990-04-01	19.5041152263729
1990-07-01	19.6624867900148
1990-10-01	19.9297990400759
1991-01-01	20.2280579257221
1991-04-01	19.3668219320517
1991-07-01	19.7352588996133
1991-10-01	20.1645484344570
1992-01-01	20.2910691028115
1992-04-01	19.9833372384138
1992-07-01	19.9708034162013
1992-10-01	20.1426563978908
1993-01-01	20.6397462587156
1993-04-01	20.4189162255691
1993-07-01	20.1937745441455
1993-10-01	19.8699974257102
1994-01-01	20.7889777346638
1994-04-01	20.3744236738233
1994-07-01	19.9032189797573
1994-10-01	20.1750030211956
1995-01-01	20.3401169014646
1995-04-01	19.6228655046654
1995-07-01	19.3077634526621
1995-10-01	19.2204940535848
1996-01-01	19.8014125203933
1996-04-01	19.7775378777859
1996-07-01	19.5265750984085
1996-10-01	19.6972767152521
1997-01-01	19.9478539101884
1997-04-01	19.7929393832090
1997-07-01	19.6929121346722
1997-10-01	19.8996061628442
1998-01-01	20.4189060865244
1998-04-01	19.9419975063727
1998-07-01	19.6641590005883
1998-10-01	19.8925678994697
1999-01-01	20.5275527549123
1999-04-01	20.1564823701355
1999-07-01	20.0027511638012
1999-10-01	19.9170151531127
2000-01-01	20.4213002860564
2000-04-01	19.5831639352693
2000-07-01	19.1820036693334
2000-10-01	19.7035636010652
2001-01-01	20.1252278351715
2001-04-01	19.0978248862679
2001-07-01	19.2168631552157
2001-10-01	19.3481786412269
2002-01-01	19.6282868579518
2002-04-01	19.2674259841829
2002-07-01	19.0297264683628
2002-10-01	18.8863490264155
2003-01-01	18.7620915713168
2003-04-01	18.7070853462109
2003-07-01	18.9831170871020
2003-10-01	19.1570802700416
2004-01-01	19.5497837633528
2004-04-01	19.2173366202919
2004-07-01	19.1682578849050
2004-10-01	18.8863898760742
2005-01-01	18.6031404025388
2005-04-01	17.8863204821766
2005-07-01	17.8433341817711
2005-10-01	17.9501822047591
2006-01-01	18.2714897354152
2006-04-01	17.7235425797575
2006-07-01	17.5290892832949
2006-10-01	17.6264173740824
2007-01-01	17.7563819152732
2007-04-01	17.3381951919878
2007-07-01	17.0672114011325
2007-10-01	16.9259867267179
2008-01-01	17.1654998707719
2008-04-01	16.8063367072198
2008-07-01	16.8497732002764
2008-10-01	16.7485933848302
2009-01-01	17.0291573460132
2009-04-01	16.7985520843576
2009-07-01	17.0950528663816
2009-10-01	17.4317377123293
2010-01-01	17.6916322750868
2010-04-01	17.3474355239970
2010-07-01	16.9850068487531
2010-10-01	16.7359583418901
2011-01-01	17.0872430595953
2011-04-01	16.8424930384368
2011-07-01	16.8557926298706
2011-10-01	16.9233490662002
2012-01-01	17.3526365677562
2012-04-01	17.1512757544470
2012-07-01	17.0938086864537
2012-10-01	17.1773981640044
2013-01-01	17.1756414814932
2013-04-01	16.8579199341738
2013-07-01	17.1583793216166
2013-10-01	17.1251003301344
2014-01-01	17.2587547355912
2014-04-01	17.1281589741123
2014-07-01	17.1822908372438
2014-10-01	17.2109730674962
2015-01-01	16.8332520287667
2015-04-01	16.5960183898920
2015-07-01	16.5639396997406
2015-10-01	16.5460406318252
2016-01-01	16.5908591836266
2016-04-01	16.5103029898078
2016-07-01	16.7021014852491
2016-10-01	16.4398329532559
2017-01-01	16.5991893716187
2017-04-01	16.0094434643518
2017-07-01	16.1628556580168
2017-10-01	15.5291510660909
2018-01-01	15.6136575861273
2018-04-01	15.3583973029198
2018-07-01	15.7688081018114