Month Percent 1999-06-01 22.0431780003733 1999-07-01 21.9936610527624 1999-08-01 22.4306029932311 1999-09-01 22.2787638078689 1999-10-01 22.1257596428128 1999-11-01 22.2773197793343 1999-12-01 22.6062182583922 2000-01-01 23.4981544330765 2000-02-01 23.7903350603208 2000-03-01 23.2950362244866 2000-04-01 22.8643495678623 2000-05-01 22.6379095298665 2000-06-01 22.7689118915284 2000-07-01 22.0557708062559 2000-08-01 22.7380388441497 2000-09-01 22.6340078533549 2000-10-01 22.3577734936208 2000-11-01 22.5112740436236 2000-12-01 22.9906473320994 2001-01-01 24.3698561248145 2001-02-01 24.2522513685992 2001-03-01 23.6140813137657 2001-04-01 22.5481187439507 2001-05-01 22.1997073750069 2001-06-01 22.1933392458485 2001-07-01 21.9158998423580 2001-08-01 22.6039816120584 2001-09-01 22.5850348438434 2001-10-01 22.3578772762200 2001-11-01 22.2768597055669 2001-12-01 22.6797970754998 2002-01-01 22.9565048094766 2002-02-01 22.9671645783557 2002-03-01 22.6941563215876 2002-04-01 21.7994424570759 2002-05-01 21.7733661172328 2002-06-01 21.6909355660721 2002-07-01 21.2699913911219 2002-08-01 22.0409226686379 2002-09-01 21.9584282184214 2002-10-01 21.7719634763982 2002-11-01 21.7582789870416 2002-12-01 21.9692984842714 2003-01-01 22.4942316287947 2003-02-01 22.5497652072092 2003-03-01 22.2287230834188 2003-04-01 21.8632484813422 2003-05-01 21.6186926916200 2003-06-01 21.6376099031709 2003-07-01 21.2143441242965 2003-08-01 22.1824149269342 2003-09-01 22.1205438955951 2003-10-01 21.6186838660085 2003-11-01 21.4709378414398 2003-12-01 21.5064860259441 2004-01-01 22.0328823941931 2004-02-01 22.1767549982326 2004-03-01 21.6085758773506 2004-04-01 21.4646615821171 2004-05-01 21.3761242796532 2004-06-01 21.1707859658775 2004-07-01 21.1214082133830 2004-08-01 22.1504888289009 2004-09-01 21.6297534475554 2004-10-01 21.1156329438723 2004-11-01 21.1007696438160 2004-12-01 21.2840719948933 2005-01-01 22.1063116582567 2005-02-01 22.3545541249404 2005-03-01 21.6882474570817 2005-04-01 21.2560760579489 2005-05-01 21.1503191692073 2005-06-01 21.0901277846885 2005-07-01 21.0485305226593 2005-08-01 22.0426816585348 2005-09-01 22.1837006079027 2005-10-01 21.8135772155202 2005-11-01 21.7629074879427 2005-12-01 22.3521540392677 2006-01-01 22.8912171990114 2006-02-01 22.8973453209362 2006-03-01 22.0160904749818 2006-04-01 21.6364718991163 2006-05-01 21.5607079354239 2006-06-01 21.5893790532635 2006-07-01 21.4633458812199 2006-08-01 22.1685163894038 2006-09-01 22.2820098004736 2006-10-01 22.0030215726231 2006-11-01 21.9203418103070 2006-12-01 22.4670994911388 2007-01-01 22.8722969262941 2007-02-01 23.0661911071935 2007-03-01 22.2220277884716 2007-04-01 21.7354813139673 2007-05-01 21.4874926504404 2007-06-01 21.4519936278329 2007-07-01 21.3560089912701 2007-08-01 22.0583457111029 2007-09-01 22.2716155281735 2007-10-01 21.9964229693984 2007-11-01 21.9620791146011 2007-12-01 22.6106095003726 2008-01-01 23.2309422860604 2008-02-01 23.4711048615753 2008-03-01 22.6819676284469 2008-04-01 22.1253804157102 2008-05-01 21.8708509354255 2008-06-01 21.9024706740238 2008-07-01 21.7491540976085 2008-08-01 22.3765042979943 2008-09-01 22.9076353057730 2008-10-01 22.6584944316634 2008-11-01 22.4613942107038 2008-12-01 23.2755025678231 2009-01-01 23.9789519292165 2009-02-01 24.0802999566932 2009-03-01 23.4793208136111 2009-04-01 22.7447140401016 2009-05-01 22.3912944549364 2009-06-01 21.9150363204383 2009-07-01 22.4534762880978 2009-08-01 23.0466777493461 2009-09-01 23.1068919171813 2009-10-01 23.1641652307971 2009-11-01 22.7296412510337 2009-12-01 23.3171825118301 2010-01-01 23.5136371078379 2010-02-01 23.7146097978025 2010-03-01 23.4138197487831 2010-04-01 22.5897382411474 2010-05-01 22.2267281728933 2010-06-01 22.2710643327517 2010-07-01 21.9312445898396 2010-08-01 22.9247613700168 2010-09-01 23.1097222300144 2010-10-01 22.6744837791180 2010-11-01 22.7665351134996 2010-12-01 22.9633438214304 2011-01-01 23.9101311749930 2011-02-01 23.2850354704859 2011-03-01 22.4573249543165 2011-04-01 22.2934758405700 2011-05-01 22.0682142797597 2011-06-01 21.8557136270463 2011-07-01 21.9689107669084 2011-08-01 22.4418249895992 2011-09-01 23.0572506379674 2011-10-01 22.3300001663810 2011-11-01 22.2217296374699 2011-12-01 22.6042052535260 2012-01-01 23.2844059022631 2012-02-01 22.9526773425020 2012-03-01 22.6273096985236 2012-04-01 21.9534698703322 2012-05-01 21.6039740582310 2012-06-01 21.6343924573296 2012-07-01 21.6356233310529 2012-08-01 22.1641181792105 2012-09-01 22.1350632729840 2012-10-01 22.0211827007944 2012-11-01 22.1957606328730 2012-12-01 23.0065517677671 2013-01-01 23.2938444692664 2013-02-01 23.4414088487401 2013-03-01 22.9158648294973 2013-04-01 22.1418481039098 2013-05-01 21.7674367497184 2013-06-01 21.6514315517857 2013-07-01 21.5316412636754 2013-08-01 22.0052197561190 2013-09-01 21.9733496975541 2013-10-01 21.7568181693742 2013-11-01 21.7125850712301 2013-12-01 21.9695520266761 2014-01-01 21.9481810929834 2014-02-01 21.5470367297026 2014-03-01 21.6593281281543 2014-04-01 20.7205291368809 2014-05-01 21.0156377703918 2014-06-01 20.9206342292111 2014-07-01 20.5402286964520 2014-08-01 20.8751883134188 2014-09-01 21.0762648748852 2014-10-01 21.0263712850838 2014-11-01 21.0116625835855 2014-12-01 21.4103044420192 2015-01-01 21.7338449264901 2015-02-01 21.3753457345843 2015-03-01 21.4985390816000 2015-04-01 20.7788197435356 2015-05-01 20.6266954727831 2015-06-01 20.6933688352031 2015-07-01 20.4504143855625 2015-08-01 21.0997663753569 2015-09-01 21.1959694682898 2015-10-01 21.1967918369112 2015-11-01 21.2746183979468 2015-12-01 21.5048420461358 2016-01-01 21.9985416047749 2016-02-01 21.6313550170619 2016-03-01 21.3416575384599 2016-04-01 21.1857869553725 2016-05-01 20.8719936597963 2016-06-01 20.6189123486004 2016-07-01 20.4704335124588 2016-08-01 20.6828900207508 2016-09-01 20.7988401672919 2016-10-01 20.8608861080123 2016-11-01 20.9706885680565 2016-12-01 21.4423133922172 2017-01-01 21.9415509570950 2017-02-01 21.1447220322370 2017-03-01 20.8339615326628 2017-04-01 20.1479678649120 2017-05-01 20.1823750746887 2017-06-01 20.0846371692851 2017-07-01 20.0953124579306 2017-08-01 20.5731242325672 2017-09-01 20.5489118724413 2017-10-01 20.8349939141955 2017-11-01 20.7620934953877 2017-12-01 21.0404985430435 2018-01-01 21.4230671818334 2018-02-01 21.5432125379956 2018-03-01 20.7259252067252 2018-04-01 20.5253789309024 2018-05-01 20.2357638045912 2018-06-01 20.6087223951786 2018-07-01 20.6254585473221 2018-08-01 20.8108574634273 2018-09-01 20.9513793382412