Quarter	Percent
1978-01-01	53.0508905875342
1978-04-01	49.0422154623008
1978-07-01	49.4760753398304
1978-10-01	50.3599474891200
1979-01-01	52.2442115028662
1979-04-01	48.9918727097882
1979-07-01	48.9574542556848
1979-10-01	50.1715801598375
1980-01-01	52.3488926208469
1980-04-01	48.7442501853492
1980-07-01	48.5618750218126
1980-10-01	50.2086825245935
1981-01-01	52.3762870956579
1981-04-01	48.7455378926661
1981-07-01	49.0530563119373
1981-10-01	49.4265538187248
1982-01-01	51.3402623811733
1982-04-01	48.3655035396636
1982-07-01	48.8674795419263
1982-10-01	49.0240584552604
1983-01-01	50.1119566327185
1983-04-01	47.0831221787600
1983-07-01	47.3130301144991
1983-10-01	48.3397509147283
1984-01-01	50.4393286672752
1984-04-01	47.0305888402109
1984-07-01	47.0821196224756
1984-10-01	48.0366315221922
1985-01-01	49.8283517821922
1985-04-01	46.9827026193948
1985-07-01	47.1797769884516
1985-10-01	48.5168076609564
1986-01-01	49.7360566953824
1986-04-01	46.9411292315484
1986-07-01	47.2726708008369
1986-10-01	48.4034152116821
1987-01-01	49.8284368984330
1987-04-01	46.7074272404487
1987-07-01	47.2754036341633
1987-10-01	47.9359705734657
1988-01-01	49.3160695084904
1988-04-01	46.4820731696408
1988-07-01	46.8117222867824
1988-10-01	47.8265138399962
1989-01-01	48.7643519551573
1989-04-01	45.6500152316881
1989-07-01	46.0906256149902
1989-10-01	46.7879034345609
1990-01-01	47.6827564210686
1990-04-01	45.0256170865558
1990-07-01	45.3850184634376
1990-10-01	46.1809666468106
1991-01-01	47.1593411628323
1991-04-01	44.3889792550786
1991-07-01	44.7193752290844
1991-10-01	45.2481037537436
1992-01-01	46.7721277729362
1992-04-01	44.3993363915061
1992-07-01	44.9987297753941
1992-10-01	45.1863909518915
1993-01-01	47.3225569013910
1993-04-01	44.8110797257148
1993-07-01	45.2266588049363
1993-10-01	45.6345404753745
1994-01-01	47.1378619408352
1994-04-01	44.5633405230261
1994-07-01	45.5059342443437
1994-10-01	46.1603033255126
1995-01-01	47.1555549655980
1995-04-01	44.9061376223285
1995-07-01	45.2504456056310
1995-10-01	46.3140104849514
1996-01-01	47.2762931635108
1996-04-01	44.7078955486394
1996-07-01	44.8156346370155
1996-10-01	45.9041486983109
1997-01-01	46.5137411288651
1997-04-01	44.2253037475041
1997-07-01	44.3312698368897
1997-10-01	45.2908494445561
1998-01-01	46.1240670828714
1998-04-01	44.1870758929377
1998-07-01	44.6646133808281
1998-10-01	45.6496191829697
1999-01-01	46.6457276243831
1999-04-01	44.5267140736076
1999-07-01	44.9020519689806
1999-10-01	45.8385301451420
2000-01-01	46.8805257420293
2000-04-01	44.8522735640656
2000-07-01	45.2087204552448
2000-10-01	45.5537388196131
2001-01-01	46.1660555062684
2001-04-01	44.9315619356469
2001-07-01	45.3454963820910
2001-10-01	45.5877925161134
2002-01-01	46.7412283738440
2002-04-01	45.5201938834241
2002-07-01	45.6031390165030
2002-10-01	45.8849061203210
2003-01-01	46.9122175492088
2003-04-01	45.2453325006442
2003-07-01	45.4915976345933
2003-10-01	45.9901611387780
2004-01-01	46.6242800264837
2004-04-01	45.2987755265326
2004-07-01	44.9694948327047
2004-10-01	45.9411870438698
2005-01-01	46.4412075588911
2005-04-01	44.6050987995656
2005-07-01	44.6027750131725
2005-10-01	45.3966966776933
2006-01-01	46.0574078603587
2006-04-01	44.4844056830553
2006-07-01	44.3596619832786
2006-10-01	44.6653246252558
2007-01-01	45.7340201093277
2007-04-01	43.9085958085829
2007-07-01	44.3426209735514
2007-10-01	44.2799206245359
2008-01-01	45.3176137409359
2008-04-01	43.5944593985031
2008-07-01	44.1086342855621
2008-10-01	44.3746038844080
2009-01-01	44.6247210033058
2009-04-01	43.4985262869285
2009-07-01	43.3821478358392
2009-10-01	44.0143438136217
2010-01-01	44.4000201268519
2010-04-01	43.3580922651440
2010-07-01	43.1831341191782
2010-10-01	43.5171236606710
2011-01-01	44.1521074680654
2011-04-01	43.3664182435295
2011-07-01	43.6414797965792
2011-10-01	43.5849795273024
2012-01-01	44.2989982688047
2012-04-01	43.0452235130420
2012-07-01	43.2246548679822
2012-10-01	43.2797846959146
2013-01-01	43.1753390589401
2013-04-01	42.1071084208740
2013-07-01	42.2384701609216
2013-10-01	41.6207746838921
2014-01-01	42.5364456006491
2014-04-01	41.4078273245384
2014-07-01	41.3983692570913
2014-10-01	41.0944758553991
2015-01-01	41.7995146695775
2015-04-01	40.8337459452656
2015-07-01	40.6095958879812
2015-10-01	40.6834316646915
2016-01-01	40.6883481804667
2016-04-01	39.8472376922032
2016-07-01	39.2727752758988
2016-10-01	39.4193556427521
2017-01-01	39.8110439396401
2017-04-01	38.3579454035978
2017-07-01	38.0253253266598
2017-10-01	38.0351702049947
2018-01-01	37.7349953918377
2018-04-01	36.5642159972751
2018-07-01	36.2252172840097