Quarter	Percent
1968-01-01	50.2021144191118
1968-04-01	56.4972788978359
1968-07-01	55.1118497913636
1968-10-01	51.7481256035502
1969-01-01	49.7639010236995
1969-04-01	55.2545026976211
1969-07-01	54.9406475927898
1969-10-01	51.5109898665272
1970-01-01	50.5938354879852
1970-04-01	55.1898950761402
1970-07-01	55.2288533225857
1970-10-01	53.0545900207927
1971-01-01	51.7435930754388
1971-04-01	55.5075612095919
1971-07-01	53.7411190824893
1971-10-01	50.6743515567305
1972-01-01	49.9582633554100
1972-04-01	51.7834108444126
1972-07-01	50.9454575192353
1972-10-01	50.2623646609533
1973-01-01	49.7173514626252
1973-04-01	51.3366678975719
1973-07-01	50.7841632620937
1973-10-01	48.9080210318413
1974-01-01	45.2451485458194
1974-04-01	49.0941236702029
1974-07-01	47.6518828628373
1974-10-01	46.4841703245150
1975-01-01	43.9503211514669
1975-04-01	47.4970221926780
1975-07-01	46.5760164133484
1975-10-01	44.6211384306210
1976-01-01	43.3299366307893
1976-04-01	45.2865841620944
1976-07-01	45.1143813142528
1976-10-01	43.5405972734379
1977-01-01	42.6986785628870
1977-04-01	46.9201854964503
1977-07-01	45.6447029927372
1977-10-01	43.9668136245109
1978-01-01	42.4006712723527
1978-04-01	46.7313713880310
1978-07-01	46.0488839656611
1978-10-01	43.3826185871060
1979-01-01	42.3600373845913
1979-04-01	46.0559796437659
1979-07-01	46.0753742510926
1979-10-01	42.8944669530566
1980-01-01	40.2202017255258
1980-04-01	45.3650871872834
1980-07-01	46.8166536947140
1980-10-01	43.4646277761679
1981-01-01	41.4527456924342
1981-04-01	46.2455453130353
1981-07-01	45.2688647210069
1981-10-01	42.7656224639402
1982-01-01	40.9851646710238
1982-04-01	45.0816769132078
1982-07-01	44.6762810594963
1982-10-01	43.5417118490289
1983-01-01	42.2204476324794
1983-04-01	46.8907502585154
1983-07-01	45.3995165831950
1983-10-01	43.5085412199660
1984-01-01	41.3614765000918
1984-04-01	46.1783105089389
1984-07-01	46.2768257395820
1984-10-01	43.6729201489810
1985-01-01	42.1182700794351
1985-04-01	44.4669176680435
1985-07-01	44.2059888422190
1985-10-01	42.8459743434384
1986-01-01	42.4607436710875
1986-04-01	45.0886126491342
1986-07-01	44.9817310148702
1986-10-01	42.7357257108244
1987-01-01	41.1485229863116
1987-04-01	44.9864012643675
1987-07-01	44.1649743685387
1987-10-01	42.7170013304467
1988-01-01	41.1597353569052
1988-04-01	45.0429928545089
1988-07-01	44.2308727665649
1988-10-01	42.8523021014085
1989-01-01	41.7396168939088
1989-04-01	46.3675712834620
1989-07-01	45.1425995860233
1989-10-01	43.5526316831511
1990-01-01	41.8296424120410
1990-04-01	46.7920338759747
1990-07-01	45.9931808217538
1990-10-01	45.1083300484588
1991-01-01	42.7532209574463
1991-04-01	48.2325407293823
1991-07-01	46.7499613910839
1991-10-01	45.9175447520050
1992-01-01	44.1426280479422
1992-04-01	49.1614406912866
1992-07-01	47.1118747381278
1992-10-01	45.7786702694479
1993-01-01	43.8428784732990
1993-04-01	48.6776393163101
1993-07-01	47.7234934854991
1993-10-01	46.5949023048959
1994-01-01	45.0392289316413
1994-04-01	49.0416826628292
1994-07-01	47.9482174408388
1994-10-01	46.9458856277115
1995-01-01	45.5887146373763
1995-04-01	48.6228420815747
1995-07-01	47.9259259259259
1995-10-01	46.9978553163408
1996-01-01	45.7351135501841
1996-04-01	49.8503143188183
1996-07-01	48.9588269957305
1996-10-01	45.9684023100208
1997-01-01	45.4146395204271
1997-04-01	49.1528815803022
1997-07-01	49.0274773300014
1997-10-01	47.0122738914247
1998-01-01	46.1503973350713
1998-04-01	49.7619043151853
1998-07-01	48.4775152539957
1998-10-01	46.5790586284500
1999-01-01	45.5061236352182
1999-04-01	49.3254504243449
1999-07-01	47.3350409104393
1999-10-01	45.2884450583670
2000-01-01	44.8371805502542
2000-04-01	48.1258525796463
2000-07-01	47.1711800940044
2000-10-01	47.0987168557501
2001-01-01	45.4094450203400
2001-04-01	48.1621645202017
2001-07-01	46.8096877798532
2001-10-01	45.2870184660073
2002-01-01	43.1152606168295
2002-04-01	46.7109764731166
2002-07-01	46.0019137087866
2002-10-01	43.9130527392082
2003-01-01	42.4937176589544
2003-04-01	46.1717443920453
2003-07-01	45.7646482269208
2003-10-01	43.7477019840151
2004-01-01	42.6635965257946
2004-04-01	45.4253347814551
2004-07-01	45.8703020186222
2004-10-01	43.6897593160498
2005-01-01	42.7972814881142
2005-04-01	47.1234003555379
2005-07-01	46.0312805886522
2005-10-01	44.4167118674712
2006-01-01	43.2901234111040
2006-04-01	47.1781573682297
2006-07-01	46.0304126490976
2006-10-01	44.4374851930822
2007-01-01	43.0371451859394
2007-04-01	47.0523535860305
2007-07-01	44.9502260766496
2007-10-01	43.8105687450880
2008-01-01	43.3407267579047
2008-04-01	47.3489546561846
2008-07-01	44.2722596536985
2008-10-01	43.6754907696308
2009-01-01	42.5954050803014
2009-04-01	47.1633632918676
2009-07-01	44.8959660649906
2009-10-01	43.7373106971419
2010-01-01	41.8267371829170
2010-04-01	45.2304394426581
2010-07-01	43.8444677596614
2010-10-01	43.9270450611118
2011-01-01	42.6974905334448
2011-04-01	45.9426992273419
2011-07-01	43.4405214189676
2011-10-01	41.4418714598733
2012-01-01	39.4265586667215
2012-04-01	43.4415225460002
2012-07-01	43.6731266149871
2012-10-01	41.4579855314413
2013-01-01	40.7371883675810
2013-04-01	44.8603944405098
2013-07-01	43.5612290710367
2013-10-01	43.4661271916174
2014-01-01	41.3957518124185
2014-04-01	44.7442287450719
2014-07-01	43.9426320800389
2014-10-01	42.8900551588326
2015-01-01	39.9769613888172
2015-04-01	45.1212537066017
2015-07-01	43.3817594834544
2015-10-01	43.1955796457216
2016-01-01	42.7922457866920
2016-04-01	45.4593786550898
2016-07-01	45.7676828510520
2016-10-01	44.2119552228818
2017-01-01	42.6555877125017
2017-04-01	46.4608611882361
2017-07-01	46.5433738199337
2017-10-01	44.4947886207021
2018-01-01	46.4003843641280
2018-04-01	49.4106329400447
2018-07-01	49.4368462940529