Quarter	Percent
1978-01-01	46.6377756497633
1978-04-01	50.7169787789027
1978-07-01	50.2911011863321
1978-10-01	49.4077320840271
1979-01-01	47.5240386125079
1979-04-01	50.7309409022598
1979-07-01	50.7194576968244
1979-10-01	49.5216593704685
1980-01-01	47.2915782417627
1980-04-01	50.9578697273510
1980-07-01	51.0881280149249
1980-10-01	49.4571625161112
1981-01-01	47.3361368246732
1981-04-01	50.9521634604034
1981-07-01	50.6677978268232
1981-10-01	50.2412314858208
1982-01-01	48.3511108707279
1982-04-01	51.3269654375480
1982-07-01	50.8409913074890
1982-10-01	50.6182279238032
1983-01-01	49.5602299837324
1983-04-01	52.5452618874655
1983-07-01	52.3089000802530
1983-10-01	51.2314228288807
1984-01-01	49.0957609484424
1984-04-01	52.4910400115560
1984-07-01	52.4700851591621
1984-10-01	51.5092219939460
1985-01-01	49.7038471891012
1985-04-01	52.4342214020223
1985-07-01	52.2314725119890
1985-10-01	51.0118735155758
1986-01-01	49.8153426902584
1986-04-01	52.3807672670733
1986-07-01	52.2595836905541
1986-10-01	51.1015059068578
1987-01-01	49.6632521456309
1987-04-01	52.7140773397018
1987-07-01	52.2188187831544
1987-10-01	51.6235315099039
1988-01-01	50.1806347222262
1988-04-01	53.0441305104975
1988-07-01	52.7086098766206
1988-10-01	51.7304095072815
1989-01-01	50.7301128439935
1989-04-01	53.8245472301785
1989-07-01	53.4621764498019
1989-10-01	52.7452742283129
1990-01-01	51.7744417102632
1990-04-01	54.5161315001625
1990-07-01	54.1645417972338
1990-10-01	53.3904865850806
1991-01-01	52.3781150296954
1991-04-01	55.1772755915236
1991-07-01	54.9299741309828
1991-10-01	54.2989967927089
1992-01-01	52.9400545425028
1992-04-01	55.3404604434789
1992-07-01	54.8304489836649
1992-10-01	54.5954222932936
1993-01-01	52.4934957226094
1993-04-01	55.0324743059270
1993-07-01	54.6646957116015
1993-10-01	54.2773340186544
1994-01-01	52.7876274516225
1994-04-01	55.3351544279136
1994-07-01	54.4467542601001
1994-10-01	53.7654699022470
1995-01-01	52.7904557206645
1995-04-01	55.0129275171992
1995-07-01	54.6686495769355
1995-10-01	53.6455881740281
1996-01-01	52.6698306956297
1996-04-01	55.2315391370407
1996-07-01	55.1238489065219
1996-10-01	53.9951178998465
1997-01-01	53.4058042859404
1997-04-01	55.6742582857997
1997-07-01	55.5616417300226
1997-10-01	54.6088898050540
1998-01-01	53.7756963565951
1998-04-01	55.6927210786530
1998-07-01	55.2686545339734
1998-10-01	54.2637007550942
1999-01-01	53.2342403628118
1999-04-01	55.2999579071933
1999-07-01	54.9979800097014
1999-10-01	54.0749030558473
2000-01-01	52.9796539904009
2000-04-01	55.0345395355134
2000-07-01	54.6780780396617
2000-10-01	54.3597953774918
2001-01-01	53.7473350483460
2001-04-01	54.9885206266239
2001-07-01	54.5612901072603
2001-10-01	54.3523643869778
2002-01-01	53.1987355741026
2002-04-01	54.4197553767303
2002-07-01	54.3301409301070
2002-10-01	54.0350510848105
2003-01-01	53.0075966514079
2003-04-01	54.6611564560941
2003-07-01	54.4215740637757
2003-10-01	53.9028765834727
2004-01-01	53.2619650557474
2004-04-01	54.6275858362848
2004-07-01	54.8897490940894
2004-10-01	53.9783461971288
2005-01-01	53.4112147814580
2005-04-01	55.2873959767739
2005-07-01	55.2964090488240
2005-10-01	54.4956787699766
2006-01-01	53.8549914800911
2006-04-01	55.4616295648788
2006-07-01	55.5660798286253
2006-10-01	55.2536148002269
2007-01-01	54.1914431100029
2007-04-01	56.0574957699307
2007-07-01	55.5895028035831
2007-10-01	55.6385590117524
2008-01-01	54.6347102024582
2008-04-01	56.3578172014443
2008-07-01	55.8367865997238
2008-10-01	55.5912375072580
2009-01-01	55.3204994738295
2009-04-01	56.4603468366578
2009-07-01	56.5972774405381
2009-10-01	55.9650588622829
2010-01-01	55.5380319254811
2010-04-01	56.5936727395746
2010-07-01	56.7203146260431
2010-10-01	56.4207388011515
2011-01-01	55.8063958667854
2011-04-01	56.6335817564705
2011-07-01	56.3585202034208
2011-10-01	56.4080702363896
2012-01-01	55.6802519605628
2012-04-01	56.9339907857228
2012-07-01	56.7614822360589
2012-10-01	56.7202153040854
2013-01-01	56.8246609410599
2013-04-01	57.8928915791260
2013-07-01	57.7615298390784
2013-10-01	58.3792253161079
2014-01-01	57.4635543993509
2014-04-01	58.5921726754616
2014-07-01	58.6016307429087
2014-10-01	58.9055241446009
2015-01-01	58.2004853304225
2015-04-01	59.1662540547344
2015-07-01	59.3904041120188
2015-10-01	59.3165683353085
2016-01-01	59.3116518195333
2016-04-01	60.1527623077967
2016-07-01	60.7272247241012
2016-10-01	60.5806443572479
2017-01-01	60.1889560603599
2017-04-01	61.6420545964022
2017-07-01	61.9746746733402
2017-10-01	61.9648297950053
2018-01-01	62.2650046081623
2018-04-01	63.4357840027249
2018-07-01	63.7747827159903