Quarter	Percent
1999-07-01	92.7814012632908
1999-10-01	92.9872078138838
2000-01-01	91.6928142409404
2000-04-01	92.5991463643823
2000-07-01	92.2678892807418
2000-10-01	92.2492059620082
2001-01-01	90.7152353917758
2001-04-01	92.2886819922505
2001-07-01	91.9968153147757
2001-10-01	92.1306383352029
2002-01-01	91.1850401397442
2002-04-01	92.3176563983651
2002-07-01	91.9423364038043
2002-10-01	92.1081065919202
2003-01-01	91.8152066910646
2003-04-01	92.4850789035662
2003-07-01	91.8422244595122
2003-10-01	91.9335625128651
2004-01-01	91.4807415493600
2004-04-01	92.0964083139344
2004-07-01	91.5377717445591
2004-10-01	91.7305525324788
2005-01-01	91.0699196202299
2005-04-01	91.9248690690355
2005-07-01	91.0518257226641
2005-10-01	91.1083037001558
2006-01-01	90.3556659011376
2006-04-01	91.3719879837989
2006-07-01	90.8855942046054
2006-10-01	90.7869354476778
2007-01-01	89.9007509865069
2007-04-01	91.0591345122841
2007-07-01	90.4815253748012
2007-10-01	90.5300082724402
2008-01-01	89.7956405121104
2008-04-01	90.8838031543735
2008-07-01	90.4494692841695
2008-10-01	90.5041224265122
2009-01-01	89.4954139435964
2009-04-01	90.7142105766999
2009-07-01	89.7150963038256
2009-10-01	89.8034421382816
2010-01-01	89.6088993379164
2010-04-01	90.7526132871967
2010-07-01	90.2629749872064
2010-10-01	90.2693746760340
2011-01-01	89.8718312979742
2011-04-01	90.9128936698865
2011-07-01	90.4981763552081
2011-10-01	90.6652151850636
2012-01-01	90.1675968470120
2012-04-01	91.1893974727238
2012-07-01	90.7986362598000
2012-10-01	90.6611280602674
2013-01-01	90.0399953867067
2013-04-01	91.1212235664680
2013-07-01	90.8182338013556
2013-10-01	91.0410527444438
2014-01-01	90.9677634048621
2014-04-01	91.6906044325089
2014-07-01	91.5136072040724
2014-10-01	91.4336799682825
2015-01-01	90.7301035941721
2015-04-01	91.5362715501656
2015-07-01	91.2743250604351
2015-10-01	91.0606609851062
2016-01-01	90.9402987632646
2016-04-01	91.3983721230042
2016-07-01	91.3655806526734
2016-10-01	90.9119938547571
2017-01-01	90.7059623169206
2017-04-01	91.3611835736435
2017-07-01	91.0919556630108
2017-10-01	90.8206024498394
2018-01-01	90.5271415488406
2018-04-01	91.1809716864026
2018-07-01	90.6015009307865