Month Percent 1986-01-01 29.0744747679207 1986-02-01 29.0238882797837 1986-03-01 28.9335392692984 1986-04-01 28.4489784577769 1986-05-01 28.2670155736739 1986-06-01 28.0914046740922 1986-07-01 28.2053999751153 1986-08-01 28.1913498741725 1986-09-01 28.6632892555151 1986-10-01 29.0465840360603 1986-11-01 29.2685829911325 1986-12-01 29.0503035856701 1987-01-01 28.8283540376213 1987-02-01 29.0442859648364 1987-03-01 29.2212709349524 1987-04-01 29.6335984271454 1987-05-01 29.3308340378657 1987-06-01 29.0064900386506 1987-07-01 28.8234842289324 1987-08-01 28.4462868445565 1987-09-01 28.7153726124187 1987-10-01 28.7859782579375 1987-11-01 29.4180749119145 1987-12-01 29.3064355681421 1988-01-01 29.5481844840660 1988-02-01 29.7388554660807 1988-03-01 30.1778221689132 1988-04-01 30.0486788597528 1988-05-01 29.7628703553500 1988-06-01 29.6473370575629 1988-07-01 29.7479456909345 1988-08-01 29.9942286898241 1988-09-01 30.2202726807128 1988-10-01 30.8562197092084 1988-11-01 31.0783455159151 1988-12-01 30.8180314436534 1989-01-01 30.3239715241926 1989-02-01 30.3245809175148 1989-03-01 30.3701728230979 1989-04-01 30.4550126907708 1989-05-01 30.1786029445409 1989-06-01 30.0735703595420 1989-07-01 30.0331416359719 1989-08-01 30.0877280473896 1989-09-01 30.5809311870600 1989-10-01 30.9849079195060 1989-11-01 31.4124930142434 1989-12-01 31.5427219791512 1990-01-01 31.3136635809904 1990-02-01 31.0800509350621 1990-03-01 31.1297819245183 1990-04-01 30.8623239745629 1990-05-01 30.5705859725606 1990-06-01 30.3860990680367 1990-07-01 30.2006232334442 1990-08-01 30.1544429462831 1990-09-01 30.4952837200216 1990-10-01 31.1317954371979 1990-11-01 31.6678522131613 1990-12-01 31.3905828885483 1991-01-01 31.2421906659462 1991-02-01 31.3008421354329 1991-03-01 30.5930874848756 1991-04-01 29.8102924089649 1991-05-01 29.4098518860404 1991-06-01 29.8821055101220 1991-07-01 30.3916319111821 1991-08-01 30.8399152942356 1991-09-01 30.9214353781640 1991-10-01 31.1834270247762 1991-11-01 31.4858470954115 1991-12-01 31.7746960667709 1992-01-01 31.9148847976887 1992-02-01 31.8271461356831 1992-03-01 31.4273375705631 1992-04-01 30.8971772113770 1992-05-01 30.6145067259955 1992-06-01 30.7020954050012 1992-07-01 31.2158934303841 1992-08-01 31.5489959641697 1992-09-01 31.9857156898077 1992-10-01 32.6484088283702 1992-11-01 33.6078458592433 1992-12-01 34.0359781888600 1993-01-01 34.0084671592274 1993-02-01 34.0101048284496 1993-03-01 33.6872438004789 1993-04-01 33.2160789764829 1993-05-01 32.5156651175213 1993-06-01 33.4057262456968 1993-07-01 34.1418591656126 1993-08-01 34.7156448224253 1993-09-01 34.5517629784581 1993-10-01 34.6270491309395 1993-11-01 35.1769698525519 1993-12-01 35.3628546138349 1994-01-01 35.5220716892466 1994-02-01 34.9682703866260 1994-03-01 34.8651402433796 1994-04-01 34.3128666032183 1994-05-01 33.6090279379369 1994-06-01 33.2676852704806 1994-07-01 33.3438405754004 1994-08-01 33.2437167773675 1994-09-01 33.6990775338165 1994-10-01 34.4091668278969 1994-11-01 35.4272060186189 1994-12-01 35.5714370090367 1995-01-01 35.2183897198761 1995-02-01 34.6871220569526 1995-03-01 34.1969308109020 1995-04-01 33.6073790681009 1995-05-01 33.2294438654703 1995-06-01 33.0988294330707 1995-07-01 33.0055686843398 1995-08-01 33.4037495156859 1995-09-01 33.3917229338927 1995-10-01 34.1714132625130 1995-11-01 34.5111951148590 1995-12-01 35.1358989696030 1996-01-01 34.7355622865294 1996-02-01 34.5315923062818 1996-03-01 33.7044889462830 1996-04-01 33.5284279327222 1996-05-01 33.5104675767459 1996-06-01 33.1482000360799 1996-07-01 32.9347778175971 1996-08-01 33.0886898143452 1996-09-01 33.1940136491246 1996-10-01 33.9117224953434 1996-11-01 34.5090259037339 1996-12-01 34.6332671661874 1997-01-01 34.2620009654748 1997-02-01 33.8218575688043 1997-03-01 33.9470337497323 1997-04-01 33.8953377231251 1997-05-01 33.7979159933242 1997-06-01 34.2859515706782 1997-07-01 35.0576131764812 1997-08-01 35.6470570518564 1997-09-01 35.2182151773092 1997-10-01 34.9987515464866 1997-11-01 35.0839465666745 1997-12-01 34.9972944482828 1998-01-01 34.3739073038382 1998-02-01 34.5014392867410 1998-03-01 34.4863960221480 1998-04-01 34.7517149890133 1998-05-01 34.5465623217911 1998-06-01 34.4706663402838 1998-07-01 34.7406462506318 1998-08-01 35.0600717163876 1998-09-01 35.4551795659122 1998-10-01 36.0180607034169 1998-11-01 36.3158030249529 1998-12-01 36.1618453810395 1999-01-01 35.5169961285781 1999-02-01 35.2775927322240 1999-03-01 35.4456860137100 1999-04-01 35.1973210230744 1999-05-01 34.7723796343506 1999-06-01 34.7129780290704 1999-07-01 35.2576436335122 1999-08-01 35.6233861542225 1999-09-01 36.1037748818767 1999-10-01 36.4957677088921 1999-11-01 36.9786144469689 1999-12-01 36.7242798057515 2000-01-01 36.4935461834394 2000-02-01 35.9420409526049 2000-03-01 35.5383928779468 2000-04-01 35.5966050923615 2000-05-01 35.1594241221221 2000-06-01 35.1946219662500 2000-07-01 35.2745086516836 2000-08-01 35.3812380571479 2000-09-01 35.3912963232449 2000-10-01 35.4266261174216 2000-11-01 35.7906870666275 2000-12-01 35.4664214665415 2001-01-01 35.0138762852083 2001-02-01 34.5626473382358 2001-03-01 34.7558726512030 2001-04-01 34.4655751042408 2001-05-01 34.3883378208517 2001-06-01 34.4446580225772 2001-07-01 34.8315547769767 2001-08-01 34.9957332683165 2001-09-01 35.4125850298745 2001-10-01 35.7244981173980 2001-11-01 35.8581677226262 2001-12-01 35.6993426535220 2002-01-01 35.2236589955631 2002-02-01 35.2129764309300 2002-03-01 35.0646825410482 2002-04-01 34.4831793141133 2002-05-01 34.3200849561409 2002-06-01 34.3853317193522 2002-07-01 34.3597016583082 2002-08-01 34.5581463567711 2002-09-01 35.2519063180828 2002-10-01 35.7247726376748 2002-11-01 35.9374496320916 2002-12-01 36.0119072816956 2003-01-01 36.2246570527661 2003-02-01 36.7110835483398 2003-03-01 36.9690048171372 2003-04-01 37.0772021769804 2003-05-01 36.4463725309212 2003-06-01 35.9838442072098 2003-07-01 35.9491121052825 2003-08-01 35.7525170238543 2003-09-01 36.1726691681028 2003-10-01 36.6582366152816 2003-11-01 37.3018088061348 2003-12-01 37.3878983257714 2004-01-01 37.2652606449114 2004-02-01 37.5853517906322 2004-03-01 37.8378734803214 2004-04-01 37.9583718565849 2004-05-01 37.5430147354727 2004-06-01 37.0510623293344 2004-07-01 37.4030354131535 2004-08-01 37.6665451615065 2004-09-01 38.5166691670961 2004-10-01 39.0578457511744 2004-11-01 39.7729765032143 2004-12-01 39.4893306288032 2005-01-01 39.3266253995357 2005-02-01 39.4587924395257 2005-03-01 39.6805763899093 2005-04-01 39.4998476521504 2005-05-01 39.3995178892690 2005-06-01 39.0883358488564 2005-07-01 39.0297654589698 2005-08-01 38.8381253345213 2005-09-01 38.8063164699971 2005-10-01 38.9394123438479 2005-11-01 39.3285390834547 2005-12-01 39.4487519001138 2006-01-01 39.2981634794683 2006-02-01 39.1108720183479 2006-03-01 39.4322944303403 2006-04-01 39.0994640497788 2006-05-01 38.6902150934373 2006-06-01 38.1794783729109 2006-07-01 38.0950757511189 2006-08-01 37.6953823166907 2006-09-01 37.8334968611782 2006-10-01 38.0142662141252 2006-11-01 38.4745845442602 2006-12-01 38.4665778544001 2007-01-01 38.7890615096016 2007-02-01 39.1245487082506 2007-03-01 39.3511645532321 2007-04-01 39.0427804086152 2007-05-01 38.4001809143740 2007-06-01 38.2220895949220 2007-07-01 38.3999007913720 2007-08-01 38.6577464144755 2007-09-01 38.8181322899383 2007-10-01 39.3615949199378 2007-11-01 40.2618027400567 2007-12-01 40.9540423847576 2008-01-01 40.6648098393888 2008-02-01 40.7420313718666 2008-03-01 40.8618852648379 2008-04-01 40.8504582956619 2008-05-01 40.8234504753890 2008-06-01 40.9413738405996 2008-07-01 40.8241158987693 2008-08-01 40.3279631260641 2008-09-01 40.3725914674112 2008-10-01 40.8829152776880 2008-11-01 41.5876846513502 2008-12-01 41.2358356430422 2009-01-01 41.1394525967290 2009-02-01 41.1137964657762 2009-03-01 41.5454034603828 2009-04-01 41.2671639864244 2009-05-01 41.1383562869354 2009-06-01 41.0186921159204 2009-07-01 41.1756753793230 2009-08-01 40.9247301988979 2009-09-01 41.0833738052787 2009-10-01 41.4671769963853 2009-11-01 41.9677808530268 2009-12-01 42.1088997777029 2010-01-01 41.8712253374808 2010-02-01 44.3449223127164 2010-03-01 44.4197085390393 2010-04-01 44.4513210504288 2010-05-01 44.6559216923186 2010-06-01 45.1733662539745 2010-07-01 45.4938731578076 2010-08-01 45.7290520735660 2010-09-01 45.7859186502669 2010-10-01 46.1526224620860 2010-11-01 46.5974940750189 2010-12-01 46.8481440613342 2011-01-01 46.3894893321652 2011-02-01 46.6001061138584 2011-03-01 46.7640221801936 2011-04-01 47.3790092663799 2011-05-01 47.4791989743320 2011-06-01 47.3627868921794 2011-07-01 47.2356553556446 2011-08-01 47.4782947721242 2011-09-01 47.6935840547240 2011-10-01 47.7128536435296 2011-11-01 47.8260050378710 2011-12-01 47.6724678253544 2012-01-01 47.6602505717813 2012-02-01 47.7178872588657 2012-03-01 47.7876164640220 2012-04-01 47.7071566679044 2012-05-01 47.3128633403424 2012-06-01 47.2020976582486 2012-07-01 47.1697760242036 2012-08-01 47.6971554895932 2012-09-01 47.7921014938849 2012-10-01 47.8451718798425 2012-11-01 47.6657478966498 2012-12-01 47.6636286818634 2013-01-01 47.6026044451875 2013-02-01 47.6110314742631 2013-03-01 47.8462297453597 2013-04-01 48.0003582835024 2013-05-01 47.7486798560381 2013-06-01 47.1859739854285 2013-07-01 47.2203409929805 2013-08-01 47.2015840667590 2013-09-01 47.6140735764641 2013-10-01 47.8425966059540 2013-11-01 48.3024863744604 2013-12-01 48.4806288455632 2014-01-01 48.7064776635701 2014-02-01 48.4820795582470 2014-03-01 48.4822155144070 2014-04-01 48.3020749680854 2014-05-01 47.9936179150202 2014-06-01 47.9240052345002 2014-07-01 47.8447808290779 2014-08-01 48.4857053190606 2014-09-01 48.6063476778079 2014-10-01 48.6905178952296 2014-11-01 48.6902124261796 2014-12-01 48.3252949425771 2015-01-01 48.0949457350336 2015-02-01 47.7000847685006 2015-03-01 47.9376112872272 2015-04-01 48.1959813868270 2015-05-01 48.1923141160698 2015-06-01 48.0745216786363 2015-07-01 48.0979484492522 2015-08-01 48.3189853686551 2015-09-01 48.1807191283544 2015-10-01 48.3050423337105 2015-11-01 48.7109201771494 2015-12-01 48.4107079863189 2016-01-01 47.8645718499188 2016-02-01 47.6234829255620 2016-03-01 47.7928877763344 2016-04-01 48.1595243605798 2016-05-01 48.0262131598652 2016-06-01 48.2895939067112 2016-07-01 48.0012631639950 2016-08-01 48.0531140837496 2016-09-01 48.1304532476826 2016-10-01 48.4072197099034 2016-11-01 48.4226099376999 2016-12-01 48.2825906851814 2017-01-01 47.8960963969979 2017-02-01 47.7097513115027 2017-03-01 48.0632789092952 2017-04-01 48.3681791967458 2017-05-01 48.2646957307939 2017-06-01 48.4204307863159 2017-07-01 48.6342258610966 2017-08-01 48.8178946226244 2017-09-01 48.8856279040819 2017-10-01 49.1312529632935 2017-11-01 49.3378863783023 2017-12-01 49.4092017873159 2018-01-01 49.2190045904116 2018-02-01 49.2728367992948 2018-03-01 49.1360372676554 2018-04-01 49.2902369076752 2018-05-01 49.0864955687597 2018-06-01 48.8092473189833 2018-07-01 48.7048055790804 2018-08-01 48.5499771930692