Quarter	Percent
1968-01-01	2.83447044711410
1968-04-01	2.39437093896560
1968-07-01	1.97435474767089
1968-10-01	2.18975272502340
1969-01-01	2.93744445556090
1969-04-01	2.23094064885665
1969-07-01	2.18818368287365
1969-10-01	2.60847884837922
1970-01-01	2.74437363269996
1970-04-01	2.40104240306448
1970-07-01	2.50604864781202
1970-10-01	2.26385606721917
1971-01-01	2.32958414539849
1971-04-01	2.20979028949959
1971-07-01	2.44705927856849
1971-10-01	2.24634326080199
1972-01-01	2.55546677306849
1972-04-01	2.25711377347693
1972-07-01	2.17397806571133
1972-10-01	2.30679524763922
1973-01-01	2.38659910378271
1973-04-01	2.03318868473301
1973-07-01	2.08914157045008
1973-10-01	2.15778908908114
1974-01-01	2.43423583024227
1974-04-01	2.10433601200687
1974-07-01	2.29886372411395
1974-10-01	2.18764802451925
1975-01-01	2.76229928681093
1975-04-01	2.52342723270973
1975-07-01	2.45281546325835
1975-10-01	2.16932110381396
1976-01-01	2.74508684366166
1976-04-01	2.38495990105229
1976-07-01	2.46599490980556
1976-10-01	2.13994017210245
1977-01-01	2.75920692544158
1977-04-01	2.45969851576331
1977-07-01	2.64586595706936
1977-10-01	2.49285933393712
1978-01-01	2.69151989697007
1978-04-01	2.35800363086982
1978-07-01	2.47957121118665
1978-10-01	2.48745089330998
1979-01-01	2.77923838728197
1979-04-01	2.24799272219389
1979-07-01	2.06467741750612
1979-10-01	2.26522989231062
1980-01-01	2.72483549700013
1980-04-01	2.43625553918233
1980-07-01	2.33295000265095
1980-10-01	2.26561437277419
1981-01-01	2.35399605554945
1981-04-01	2.27675793326104
1981-07-01	2.56398753931053
1981-10-01	2.74291842395620
1982-01-01	2.50401421625562
1982-04-01	2.14515734039115
1982-07-01	2.50945437421471
1982-10-01	2.33381678730853
1983-01-01	2.43682885831012
1983-04-01	2.19630398619707
1983-07-01	2.14223731174925
1983-10-01	2.31025058658583
1984-01-01	2.55329241583298
1984-04-01	2.26068084187311
1984-07-01	2.17032270190288
1984-10-01	2.27106049224937
1985-01-01	2.64064653624589
1985-04-01	2.37429001002339
1985-07-01	2.45016717018082
1985-10-01	2.67568055430872
1986-01-01	2.81789382168610
1986-04-01	2.49654006688363
1986-07-01	2.24706012253887
1986-10-01	2.71858867167693
1987-01-01	2.82084868188499
1987-04-01	2.62088760116020
1987-07-01	2.22479475262026
1987-10-01	2.43127901304574
1988-01-01	2.59608889649731
1988-04-01	2.43087235757319
1988-07-01	2.18741680309130
1988-10-01	2.38890123052306
1989-01-01	2.49394471988318
1989-04-01	2.12395649081608
1989-07-01	2.16891136943174
1989-10-01	2.47334542391938
1990-01-01	2.45108909343092
1990-04-01	2.22087607575408
1990-07-01	2.27908384660002
1990-10-01	2.23951850172821
1991-01-01	2.32177084488657
1991-04-01	2.14604647043370
1991-07-01	2.31058972258020
1991-10-01	1.95727824155654
1992-01-01	1.93432878626420
1992-04-01	2.08421613696588
1992-07-01	2.30641869221368
1992-10-01	1.96428158424172
1993-01-01	2.35590252440674
1993-04-01	1.96254979664407
1993-07-01	2.22010204588753
1993-10-01	2.01653656107353
1994-01-01	2.54151204560401
1994-04-01	2.45161213690906
1994-07-01	2.39446961659920
1994-10-01	2.46894973424535
1995-01-01	2.86928802653006
1995-04-01	2.51830965618170
1995-07-01	2.11357287744843
1995-10-01	2.32378256088775
1996-01-01	2.66362850420863
1996-04-01	2.20067609869027
1996-07-01	1.99769568188940
1996-10-01	2.28522506014660
1997-01-01	2.25433454708798
1997-04-01	2.10303351454696
1997-07-01	2.31054605727757
1997-10-01	2.50714490693954
1998-01-01	2.59177214183268
1998-04-01	2.48028151587174
1998-07-01	2.59834401355785
1998-10-01	2.66187485757045
1999-01-01	2.83737213251596
1999-04-01	2.66621052378868
1999-07-01	2.55970162645360
1999-10-01	2.48173417600635
2000-01-01	2.88283506711283
2000-04-01	2.73578805275032
2000-07-01	2.63140326868966
2000-10-01	2.45155183322033
2001-01-01	3.04616736486607
2001-04-01	2.90499351191370
2001-07-01	2.91179363598047
2001-10-01	3.13265214632580
2002-01-01	3.58140887426096
2002-04-01	3.42367126113291
2002-07-01	3.18165485932778
2002-10-01	3.23067973304183
2003-01-01	3.59410654279520
2003-04-01	3.51496294667918
2003-07-01	3.34710156490294
2003-10-01	3.25900992915607
2004-01-01	3.64094577982790
2004-04-01	3.52560713697873
2004-07-01	3.68961135844370
2004-10-01	3.68825449022441
2005-01-01	3.78227715951053
2005-04-01	3.81322740213227
2005-07-01	3.86882908628445
2005-10-01	3.80095648007779
2006-01-01	3.74719961669421
2006-04-01	3.63732894014725
2006-07-01	3.84518384065366
2006-10-01	3.66833407673269
2007-01-01	3.77197429955188
2007-04-01	3.50394851551297
2007-07-01	3.60821118619730
2007-10-01	3.60961156549830
2008-01-01	3.69511337391595
2008-04-01	3.63499944921757
2008-07-01	3.80445015575294
2008-10-01	3.84413564844946
2009-01-01	3.94184673554870
2009-04-01	3.85371647659141
2009-07-01	3.81689454435819
2009-10-01	3.87199785558620
2010-01-01	3.77574370945745
2010-04-01	3.60904047915720
2010-07-01	3.73679974080246
2010-10-01	3.86792783040763
2011-01-01	3.70533626457797
2011-04-01	3.72867909559699
2011-07-01	4.16709949965104
2011-10-01	4.18648826677387
2012-01-01	4.35191528993548
2012-04-01	4.20368358887661
2012-07-01	4.30746777589768
2012-10-01	4.47199854109883
2013-01-01	4.49718905587691
2013-04-01	4.15445022947968
2013-07-01	4.26271361211808
2013-10-01	4.22501714534804
2014-01-01	4.43907263270877
2014-04-01	4.04340982375029
2014-07-01	4.54186718392533
2014-10-01	4.51749518633393
2015-01-01	4.37991432152813
2015-04-01	4.49343588552670
2015-07-01	4.54915975493659
2015-10-01	4.36409639006736
2016-01-01	4.30625272091181
2016-04-01	4.55958137139623
2016-07-01	4.26537549267077
2016-10-01	4.28294675071218
2017-01-01	4.40039249071708
2017-04-01	4.59994045649921
2017-07-01	4.35611974475376
2017-10-01	4.28157534946623
2018-01-01	4.33405469286037
2018-04-01	4.38475935780677
2018-07-01	4.29291615194014