Quarter	Percent
1978-01-01	2.52267482797449
1978-04-01	2.20861151690765
1978-07-01	2.16207916914326
1978-10-01	2.11061301835315
1979-01-01	2.36014149507013
1979-04-01	2.04911221563902
1979-07-01	2.02500797813298
1979-10-01	1.97444318811924
1980-01-01	2.13493401586616
1980-04-01	1.93799336538359
1980-07-01	1.96079532887198
1980-10-01	2.07386011604001
1981-01-01	2.41004527725408
1981-04-01	2.29266545070386
1981-07-01	2.06725596082099
1981-10-01	2.10722572527564
1982-01-01	2.46494954643862
1982-04-01	2.36813410496202
1982-07-01	2.28648291438499
1982-10-01	2.35146545523227
1983-01-01	2.91235117289542
1983-04-01	2.66636295728144
1983-07-01	2.59286437419208
1983-10-01	2.51093569147700
1984-01-01	2.98688248766356
1984-04-01	2.75246454035851
1984-07-01	2.64481201205186
1984-10-01	2.55419869007750
1985-01-01	2.81436513284023
1985-04-01	2.58079099709534
1985-07-01	2.51723168847824
1985-10-01	2.64334234993561
1986-01-01	2.91628640651584
1986-04-01	2.78793745284230
1986-07-01	2.77014128963648
1986-10-01	2.68533950892798
1987-01-01	3.17403602878956
1987-04-01	3.04555466924215
1987-07-01	2.68730531588330
1987-10-01	2.57788930147257
1988-01-01	2.90650465652032
1988-04-01	2.50895952795124
1988-07-01	2.46386328828109
1988-10-01	2.28805072275417
1989-01-01	2.53127479472342
1989-04-01	2.33709749280350
1989-07-01	2.17856384769869
1989-10-01	2.09376320464520
1990-01-01	2.29231715533122
1990-04-01	2.13155736891668
1990-07-01	2.06009612590422
1990-10-01	2.01462333689329
1991-01-01	2.23214441645676
1991-04-01	2.11434761713211
1991-07-01	2.10770072444123
1991-10-01	2.00045462972100
1992-01-01	2.23826104551762
1992-04-01	2.11080370457578
1992-07-01	2.16954913393185
1992-10-01	2.21498199673165
1993-01-01	2.48974850467457
1993-04-01	2.44454555002680
1993-07-01	2.50793849829845
1993-10-01	2.66980866462417
1994-01-01	3.02684535643634
1994-04-01	2.84784685841493
1994-07-01	2.96173533724642
1994-10-01	2.83832589014911
1995-01-01	3.15812898581088
1995-04-01	3.12986590289811
1995-07-01	3.18516618523211
1995-10-01	3.25404719486941
1996-01-01	3.49760407662015
1996-04-01	3.49574267842707
1996-07-01	3.31898482054690
1996-10-01	3.24358951380088
1997-01-01	3.45697558262476
1997-04-01	3.45784287765343
1997-07-01	3.39797818276076
1997-10-01	3.38526543868154
1998-01-01	3.82681001267952
1998-04-01	4.24874420258609
1998-07-01	4.25159651089967
1998-10-01	4.25132305922622
1999-01-01	4.78615879474614
1999-04-01	4.94686904307994
1999-07-01	4.72587166147257
1999-10-01	4.44463856986816
2000-01-01	4.98412448596424
2000-04-01	4.92654070436455
2000-07-01	4.65886554353646
2000-10-01	4.57197816069102
2001-01-01	4.92107588814400
2001-04-01	5.13776013972393
2001-07-01	5.11149025180093
2001-10-01	5.19536197620568
2002-01-01	5.49030710267195
2002-04-01	5.61599869688214
2002-07-01	5.40733394904109
2002-10-01	5.20900237802571
2003-01-01	5.57660249681478
2003-04-01	5.61673607002001
2003-07-01	5.14568354085677
2003-10-01	4.93380751169912
2004-01-01	5.07068008996007
2004-04-01	4.87944131551890
2004-07-01	4.76234217495256
2004-10-01	4.44851565788301
2005-01-01	4.72577958550635
2005-04-01	4.53370468994918
2005-07-01	4.32696953664747
2005-10-01	4.37979352398832
2006-01-01	4.41332481127246
2006-04-01	4.23882669293462
2006-07-01	4.13809981188290
2006-10-01	3.96355974941233
2007-01-01	4.17585113004244
2007-04-01	3.84806993170846
2007-07-01	3.79670874803294
2007-10-01	3.79584854044180
2008-01-01	4.06088294430222
2008-04-01	4.08799398707546
2008-07-01	4.06094980627333
2008-10-01	3.98725877621986
2009-01-01	4.68052682392754
2009-04-01	5.28544368349255
2009-07-01	5.51975403450240
2009-10-01	5.09260770498678
2010-01-01	5.15719235156077
2010-04-01	5.35999360852569
2010-07-01	5.15043358653098
2010-10-01	4.89735447887794
2011-01-01	4.82865724000077
2011-04-01	4.81300018367461
2011-07-01	4.50596782738147
2011-10-01	4.36869431548189
2012-01-01	4.60535029263977
2012-04-01	4.64236856797922
2012-07-01	4.33467187286351
2012-10-01	4.08580331133121
2013-01-01	4.30384795190258
2013-04-01	4.26041782188574
2013-07-01	4.04263107276093
2013-10-01	3.79165926620526
2014-01-01	3.72797152061767
2014-04-01	3.80302068120433
2014-07-01	3.65249920209743
2014-10-01	3.41248974008840
2015-01-01	3.53909361456066
2015-04-01	3.49995423934588
2015-07-01	3.43693050184624
2015-10-01	3.18195730595808
2016-01-01	3.28432397818796
2016-04-01	3.30672784450162
2016-07-01	3.12887163006315
2016-10-01	2.96487459196372
2017-01-01	2.92721676909252
2017-04-01	3.02403132558565
2017-07-01	2.87880152868240
2017-10-01	2.67853904350583
2018-01-01	2.50131518319770
2018-04-01	2.51102511597177
2018-07-01	2.50073749276186