Quarter	Percent
1968-01-01	52.8093939295994
1968-04-01	58.6338076377683
1968-07-01	57.4815196404720
1968-10-01	54.5352968085069
1969-01-01	52.2613081553649
1969-04-01	57.3350557827173
1969-07-01	56.7393408488279
1969-10-01	53.9314516129032
1970-01-01	52.8614507036059
1970-04-01	57.3679490397854
1970-07-01	57.2536051948672
1970-10-01	55.0059561461361
1971-01-01	54.5727597591757
1971-04-01	58.6542743164582
1971-07-01	56.8469709397481
1971-10-01	54.2661144511916
1972-01-01	53.5845063912676
1972-04-01	55.7854383636397
1972-07-01	54.9245129450538
1972-10-01	53.0118773453695
1973-01-01	51.9506847589569
1973-04-01	54.5440857975434
1973-07-01	53.6037064844626
1973-10-01	51.1674623773534
1974-01-01	48.8015269895213
1974-04-01	52.2350566102525
1974-07-01	50.4348566197114
1974-10-01	48.8369064553890
1975-01-01	46.3738645434324
1975-04-01	49.4542587111929
1975-07-01	48.5265091864591
1975-10-01	47.5946910751451
1976-01-01	46.0751256748134
1976-04-01	47.3892310130616
1976-07-01	47.0113368696046
1976-10-01	45.0599822509395
1977-01-01	44.0813029093691
1977-04-01	46.8022052146380
1977-07-01	46.2999399523208
1977-10-01	44.2929531153273
1978-01-01	43.2016882012437
1978-04-01	47.2699980162076
1978-07-01	45.4240761119717
1978-10-01	43.3950033048850
1979-01-01	42.1811900292032
1979-04-01	46.1375693913214
1979-07-01	45.3108453199917
1979-10-01	42.8905443325243
1980-01-01	40.5909773247486
1980-04-01	44.8493820235599
1980-07-01	45.3208352929651
1980-10-01	43.0869926899246
1981-01-01	41.5659705680372
1981-04-01	45.8295206828692
1981-07-01	44.7695370758351
1981-10-01	42.5406737490017
1982-01-01	40.9979431895855
1982-04-01	45.1949519288949
1982-07-01	44.2153565755886
1982-10-01	43.4789568980746
1983-01-01	42.3694550541395
1983-04-01	46.6056974622906
1983-07-01	44.7940172515223
1983-10-01	43.3716626490696
1984-01-01	41.5118579756363
1984-04-01	45.6797669445143
1984-07-01	45.0663577946959
1984-10-01	43.2732777889720
1985-01-01	41.5483685399832
1985-04-01	44.2829552935722
1985-07-01	43.7564699891517
1985-10-01	42.5802605158504
1986-01-01	41.6380099093795
1986-04-01	44.8057504857045
1986-07-01	44.2712995368474
1986-10-01	42.4896105124539
1987-01-01	40.6709816072887
1987-04-01	44.5423394945142
1987-07-01	43.7729911683820
1987-10-01	42.2771086209971
1988-01-01	40.3520536791025
1988-04-01	44.8344295096263
1988-07-01	43.5264278106954
1988-10-01	42.3550398784122
1989-01-01	40.8443458228508
1989-04-01	45.3354174978703
1989-07-01	44.1308201732230
1989-10-01	43.0521124671718
1990-01-01	41.3068000938628
1990-04-01	46.0309165326651
1990-07-01	45.1824190243407
1990-10-01	44.6051195529600
1991-01-01	42.6015908862582
1991-04-01	47.5175830837761
1991-07-01	46.7274569845360
1991-10-01	45.6143593613406
1992-01-01	44.2339688658934
1992-04-01	48.4522403219662
1992-07-01	47.5296261706847
1992-10-01	46.4533865809025
1993-01-01	44.4574100146858
1993-04-01	48.6307432194918
1993-07-01	48.1204618729588
1993-10-01	47.5506362041144
1994-01-01	45.4235743294339
1994-04-01	49.3474612600044
1994-07-01	48.5838949544724
1994-10-01	47.4215714043815
1995-01-01	45.8004338715002
1995-04-01	48.8548249922047
1995-07-01	48.6846846846847
1995-10-01	47.4715350697600
1996-01-01	46.4307793850619
1996-04-01	50.1102708307581
1996-07-01	49.5198118690366
1996-10-01	47.2766263730812
1997-01-01	46.6402845571983
1997-04-01	50.0663106107054
1997-07-01	49.8384376553059
1997-10-01	47.8263869640183
1998-01-01	46.4291546312103
1998-04-01	50.0098743713803
1998-07-01	49.2088751062305
1998-10-01	47.7619259033804
1999-01-01	45.9848759331537
1999-04-01	49.4818233679087
1999-07-01	47.8435714912673
1999-10-01	46.2007315747324
2000-01-01	45.1820756739678
2000-04-01	48.7158197534044
2000-07-01	47.3963263409614
2000-10-01	47.1796998642908
2001-01-01	45.0177033502955
2001-04-01	48.4901603306771
2001-07-01	47.0676299478036
2001-10-01	45.5166741408699
2002-01-01	43.7849887059769
2002-04-01	47.1233162247442
2002-07-01	46.8347324272362
2002-10-01	44.3776477935388
2003-01-01	43.2795414600088
2003-04-01	46.6160352530341
2003-07-01	45.6586125231059
2003-10-01	44.1091039445586
2004-01-01	42.3213622558448
2004-04-01	45.3069389652680
2004-07-01	45.5566953466803
2004-10-01	44.0530672187235
2005-01-01	42.0576241883987
2005-04-01	46.0314810224020
2005-07-01	45.9159209431118
2005-10-01	45.0787954876424
2006-01-01	43.1435481912662
2006-04-01	46.5376032058478
2006-07-01	45.7110924206510
2006-10-01	44.3267951091155
2007-01-01	43.0012847829899
2007-04-01	47.3125560991781
2007-07-01	45.1169282765786
2007-10-01	44.0548795859095
2008-01-01	42.2841123574277
2008-04-01	46.9519125621136
2008-07-01	44.8242125861950
2008-10-01	43.7561747610513
2009-01-01	41.7264657941346
2009-04-01	45.8616724707678
2009-07-01	44.0199763126413
2009-10-01	42.4644626780912
2010-01-01	40.9766752951726
2010-04-01	44.2118042185428
2010-07-01	43.1998041023955
2010-10-01	42.7474257903135
2011-01-01	40.9643221814139
2011-04-01	45.2432909879718
2011-07-01	42.9173272889063
2011-10-01	41.2996981379188
2012-01-01	39.4506609620975
2012-04-01	43.2080481717946
2012-07-01	43.0887268866642
2012-10-01	41.1994962591578
2013-01-01	40.1472191930446
2013-04-01	44.2569916855631
2013-07-01	43.1660085262529
2013-10-01	42.1181106031976
2014-01-01	40.8017748653709
2014-04-01	44.1821411380262
2014-07-01	43.6967290092571
2014-10-01	42.2284631435893
2015-01-01	40.2366461102243
2015-04-01	44.1451964576936
2015-07-01	43.1559750136699
2015-10-01	43.2344791687311
2016-01-01	42.2165293798360
2016-04-01	45.8812011463552
2016-07-01	45.1498935321995
2016-10-01	44.5937993640721
2017-01-01	42.2312848259711
2017-04-01	46.4372329405465
2017-07-01	45.7522425974370
2017-10-01	44.1080395143477
2018-01-01	45.0969822281298
2018-04-01	48.9234791218204
2018-07-01	48.5131963225042