Quarter	Percent
1978-04-01	3.44034351940653
1978-07-01	3.49072396748696
1978-10-01	3.36727623148979
1979-01-01	3.45967519152604
1979-04-01	3.25202758265446
1979-07-01	2.97341244775599
1979-10-01	2.86432618186382
1980-01-01	3.27928977971476
1980-04-01	3.19644046123630
1980-07-01	3.12888617249671
1980-10-01	2.83630702470959
1981-01-01	3.08803671762162
1981-04-01	3.00174187799762
1981-07-01	3.27447281446716
1981-10-01	3.16236727122525
1982-01-01	3.56027738710719
1982-04-01	3.57283784151252
1982-07-01	4.29406826135148
1982-10-01	5.45053014456667
1983-01-01	6.72327668140444
1983-04-01	7.12103092069006
1983-07-01	7.08282315865358
1983-10-01	6.37704829186117
1984-01-01	6.70983910140808
1984-04-01	6.11838242429706
1984-07-01	6.06950479335983
1984-10-01	5.56636273034926
1985-01-01	6.06997795620332
1985-04-01	6.10072933389574
1985-07-01	5.71012821246101
1985-10-01	5.09641201172286
1986-01-01	5.42645147698128
1986-04-01	5.33511799978202
1986-07-01	5.60862564360400
1986-10-01	5.60743810140269
1987-01-01	6.10453406312380
1987-04-01	5.86654802798171
1987-07-01	5.59039022533785
1987-10-01	5.33795666770733
1988-01-01	5.31075339956039
1988-04-01	5.10836969206359
1988-07-01	4.87976609603069
1988-10-01	4.50271789308151
1989-01-01	4.91955984214397
1989-04-01	4.40893259680676
1989-07-01	4.28751284586891
1989-10-01	3.83323494927745
1990-01-01	4.51678462448920
1990-04-01	4.55500979303807
1990-07-01	5.19671867106677
1990-10-01	5.71291286050856
1991-01-01	7.06151925185229
1991-04-01	7.47252666442588
1991-07-01	8.06711856622725
1991-10-01	8.08701048494410
1992-01-01	8.82565208644724
1992-04-01	8.73205547112076
1992-07-01	9.00526757072049
1992-10-01	9.15406978935736
1993-01-01	9.90085031795525
1993-04-01	9.63850403368040
1993-07-01	9.31922788846987
1993-10-01	9.10162994871245
1994-01-01	9.38809935553657
1994-04-01	8.17846728344542
1994-07-01	7.78125806000266
1994-10-01	7.27492082712708
1995-01-01	7.65262979224875
1995-04-01	7.04737944351379
1995-07-01	6.97362044488560
1995-10-01	6.72594575135664
1996-01-01	7.25094617622986
1996-04-01	6.78368363697175
1996-07-01	6.95903438221254
1996-10-01	6.57151739076476
1997-01-01	7.17661806166003
1997-04-01	6.76606190430876
1997-07-01	6.65765551562753
1997-10-01	6.19015675799980
1998-01-01	6.68893947105080
1998-04-01	6.30274752577816
1998-07-01	6.39083246790496
1998-10-01	5.90748160966370
1999-01-01	6.08106290840135
1999-04-01	5.58944279777117
1999-07-01	5.48607928051565
1999-10-01	5.19411299990449
2000-01-01	5.52513876608332
2000-04-01	5.02024371109437
2000-07-01	4.94180814067006
2000-10-01	4.81539929315644
2001-01-01	5.38336473031418
2001-04-01	5.35400986712770
2001-07-01	5.40128659959406
2001-10-01	5.18264787208678
2002-01-01	5.62840533122078
2002-04-01	5.09266069839877
2002-07-01	4.72492875483127
2002-10-01	4.44801162235816
2003-01-01	4.86737995794842
2003-04-01	4.64038281433914
2003-07-01	4.28031046409204
2003-10-01	3.98671054318913
2004-01-01	4.17297748039391
2004-04-01	3.99049447544455
2004-07-01	3.86839542455549
2004-10-01	3.45484277304726
2005-01-01	3.80659553670243
2005-04-01	3.59318736531730
2005-07-01	3.47681984677370
2005-10-01	3.44402939678459
2006-01-01	3.83404243588874
2006-04-01	3.45281277663005
2006-07-01	3.28320401069609
2006-10-01	3.01469235616169
2007-01-01	3.25931560334899
2007-04-01	2.88055415759958
2007-07-01	2.64043882984779
2007-10-01	2.70773179005535
2008-01-01	2.82732036936908
2008-04-01	2.92685376747240
2008-07-01	2.79262864836663
2008-10-01	2.88795854928207
2009-01-01	4.17368614238167
2009-04-01	4.52764120367652
2009-07-01	4.26860622755429
2009-10-01	4.05465413499084
2010-01-01	4.17817010606823
2010-04-01	3.77665737143295
2010-07-01	3.47742729454109
2010-10-01	3.21677954481091
2011-01-01	3.42422716953966
2011-04-01	3.36201997534736
2011-07-01	3.60046286315776
2011-10-01	3.55348736133427
2012-01-01	3.83493191867978
2012-04-01	3.46520540553176
2012-07-01	3.83424872789618
2012-10-01	3.64222789426233
2013-01-01	4.26633914665376
2013-04-01	4.20363598178768
2013-07-01	4.25587433599681
2013-10-01	4.43102278205440
2014-01-01	4.65277608100446
2014-04-01	4.24700344542782
2014-07-01	4.48743427865449
2014-10-01	4.39184957620175
2015-01-01	4.76953958010486
2015-04-01	4.32034047122645
2015-07-01	4.67298163082435
2015-10-01	4.09897316896208
2016-01-01	4.47010733836175
2016-04-01	3.98601937169833
2016-07-01	4.07327144817275
2016-10-01	3.87357889215374
2017-01-01	4.29939098152735
2017-04-01	3.87162370348320
2017-07-01	4.01445563902190
2017-10-01	3.78559880958053
2018-01-01	4.16471540396667
2018-04-01	3.94679375632649
2018-07-01	3.78874609736092