Quarter	Percent
1968-01-01	39.7142902478436
1968-04-01	47.1015708646947
1968-07-01	48.0127700256522
1968-10-01	44.5621956307292
1969-01-01	40.7919761251832
1969-04-01	47.5502086513984
1969-07-01	46.8179577935969
1969-10-01	43.3724018180890
1970-01-01	40.5239011426398
1970-04-01	47.0436287232728
1970-07-01	46.6827857565587
1970-10-01	42.7748421565538
1971-01-01	39.7553449468175
1971-04-01	47.1336555875146
1971-07-01	47.0450621544144
1971-10-01	44.7092802754033
1972-01-01	38.6796724670594
1972-04-01	44.7841755010697
1972-07-01	45.7763253858699
1972-10-01	43.7611234705228
1973-01-01	41.1251828809961
1973-04-01	44.7267637916835
1973-07-01	45.5190454007955
1973-10-01	44.8614790828509
1974-01-01	40.4210526315790
1974-04-01	45.3081232492997
1974-07-01	44.9030296414553
1974-10-01	42.4341513707380
1975-01-01	39.2146544297310
1975-04-01	45.0801326630927
1975-07-01	45.8939687676107
1975-10-01	42.1878279182146
1976-01-01	39.7048960429242
1976-04-01	45.1393213572854
1976-07-01	46.4846961360906
1976-10-01	43.4050796383986
1977-01-01	39.6566395997375
1977-04-01	45.5776122888239
1977-07-01	46.6099541166676
1977-10-01	44.4457916278726
1978-01-01	40.4705190701380
1978-04-01	46.8292546504681
1978-07-01	47.1947693217801
1978-10-01	44.7657514785079
1979-01-01	41.3167078309463
1979-04-01	46.9992339243534
1979-07-01	47.1061743889158
1979-10-01	44.5896125446179
1980-01-01	41.2547536851334
1980-04-01	47.3585455959557
1980-07-01	47.5261909189141
1980-10-01	43.4356991056094
1981-01-01	40.2439090920742
1981-04-01	46.0548241731374
1981-07-01	46.2555254754548
1981-10-01	43.9881118889703
1982-01-01	41.2388504034993
1982-04-01	46.6908908724598
1982-07-01	45.9575685033030
1982-10-01	43.8874976840540
1983-01-01	42.3844360523061
1983-04-01	47.0653740389322
1983-07-01	47.1469568848795
1983-10-01	44.8622611950761
1984-01-01	41.0705319063169
1984-04-01	46.3414038317462
1984-07-01	45.9066695704243
1984-10-01	43.7589959558531
1985-01-01	41.4938494959761
1985-04-01	47.1929857476095
1985-07-01	46.3450763419993
1985-10-01	43.4148532633607
1986-01-01	40.5678022543423
1986-04-01	45.1158193589471
1986-07-01	45.6422260718961
1986-10-01	44.1472263852935
1987-01-01	41.1378843029752
1987-04-01	45.3596303071747
1987-07-01	45.6071506431219
1987-10-01	44.7644720940340
1988-01-01	42.0674437145016
1988-04-01	45.6761093870189
1988-07-01	45.8319975666587
1988-10-01	44.0625203474366
1989-01-01	42.6239838528597
1989-04-01	46.3623983855608
1989-07-01	46.7000216656338
1989-10-01	45.6581543491741
1990-01-01	43.6144964678744
1990-04-01	48.1679404041843
1990-07-01	48.2679197768431
1990-10-01	46.3782947524191
1991-01-01	45.1638297872340
1991-04-01	49.2013605962773
1991-07-01	50.0225999574246
1991-10-01	47.3586891736928
1992-01-01	46.2811362644938
1992-04-01	48.1274423736593
1992-07-01	49.3499722865952
1992-10-01	47.9091366852591
1993-01-01	46.2918482198688
1993-04-01	49.1655969191271
1993-07-01	49.2083868207103
1993-10-01	47.1717378949642
1994-01-01	45.4430358271714
1994-04-01	48.5421153801617
1994-07-01	48.3297076383262
1994-10-01	46.5613338148549
1995-01-01	46.0195828011920
1995-04-01	48.7901862581307
1995-07-01	48.6036837786754
1995-10-01	46.8384302303872
1996-01-01	44.7103274559194
1996-04-01	48.4497428814752
1996-07-01	49.0427052789568
1996-10-01	47.9764954107351
1997-01-01	46.0308607547871
1997-04-01	48.9992580059360
1997-07-01	49.6144898093741
1997-10-01	48.6618004866180
1998-01-01	46.7827271762083
1998-04-01	49.1514661174855
1998-07-01	49.8793723876129
1998-10-01	48.1035527983648
1999-01-01	46.6001085094476
1999-04-01	49.2872219089783
1999-07-01	49.5864512305518
1999-10-01	48.0738993710692
2000-01-01	46.6824614055741
2000-04-01	48.2215775675154
2000-07-01	48.8918562217626
2000-10-01	47.9296808329066
2001-01-01	46.7829624915726
2001-04-01	47.7538958817492
2001-07-01	47.5810790023502
2001-10-01	46.9405885241895
2002-01-01	46.4653215278960
2002-04-01	47.0140997513253
2002-07-01	48.0125075481721
2002-10-01	46.9225851098726
2003-01-01	46.6805281690333
2003-04-01	47.4164417459195
2003-07-01	48.1994568039964
2003-10-01	47.9065488236205
2004-01-01	47.3041759569371
2004-04-01	48.8776338729092
2004-07-01	49.3363523968596
2004-10-01	48.9718162972875
2005-01-01	48.2180589921841
2005-04-01	49.7887695894452
2005-07-01	50.3321010433682
2005-10-01	49.2684018077179
2006-01-01	48.7303366991260
2006-04-01	49.9650243309002
2006-07-01	50.5379957220488
2006-10-01	50.9048446230637
2007-01-01	50.1040222164052
2007-04-01	51.0907024925716
2007-07-01	52.1996115454059
2007-10-01	51.9070859861703
2008-01-01	50.6596152205577
2008-04-01	52.7980535279805
2008-07-01	52.4340007532809
2008-10-01	51.6062432085350
2009-01-01	51.3511564786929
2009-04-01	52.0636428698773
2009-07-01	52.3289764744567
2009-10-01	51.5366722384984
2010-01-01	51.7983092652978
2010-04-01	51.9364589635457
2010-07-01	52.8810028766679
2010-10-01	52.3328018801109
2011-01-01	52.4965279395649
2011-04-01	53.2836754946213
2011-07-01	52.6881469935002
2011-10-01	52.5214548516733
2012-01-01	52.5331083094397
2012-04-01	52.1848942845683
2012-07-01	52.3874205115745
2012-10-01	52.8216963871733
2013-01-01	53.9310196229569
2013-04-01	53.5272235986943
2013-07-01	54.6113229040877
2013-10-01	55.1702397093299
2014-01-01	55.0900605220857
2014-04-01	56.1929462060039
2014-07-01	56.2904733264265
2014-10-01	56.9431309730735
2015-01-01	57.2064599370542
2015-04-01	57.2822583614718
2015-07-01	58.4397264745863
2015-10-01	58.9786252753934
2016-01-01	59.1764292502176
2016-04-01	58.9615361620911
2016-07-01	60.2704869642342
2016-10-01	60.5075207330086
2017-01-01	61.2336909823816
2017-04-01	61.4629885966647
2017-07-01	62.6349046780102
2017-10-01	62.6345475257703
2018-01-01	63.7818740032435
2018-04-01	63.7348780391693
2018-07-01	64.9305555555556