Quarter	Percent
1999-07-01	87.0388259405362
1999-10-01	88.1407351281624
2000-01-01	86.6179048561364
2000-04-01	88.6085543894416
2000-07-01	88.4704809319976
2000-10-01	88.3839842503620
2001-01-01	85.8438231508724
2001-04-01	88.6235866681989
2001-07-01	88.5944355397942
2001-10-01	88.8536652561042
2002-01-01	87.6132768545833
2002-04-01	89.2015783031595
2002-07-01	89.0366482331422
2002-10-01	89.0838883817242
2003-01-01	88.5564713257354
2003-04-01	89.4034399124948
2003-07-01	88.7157335254780
2003-10-01	88.7476143246954
2004-01-01	88.1483644261208
2004-04-01	89.0371441463112
2004-07-01	88.2594268518323
2004-10-01	88.3382260923473
2005-01-01	87.3285860281672
2005-04-01	88.6570137374362
2005-07-01	87.7263621726514
2005-10-01	87.8747854910106
2006-01-01	86.8445044437874
2006-04-01	88.0628654586612
2006-07-01	87.6501869138667
2006-10-01	87.5974553520043
2007-01-01	86.3660396563280
2007-04-01	87.7426405136101
2007-07-01	87.4168056155530
2007-10-01	87.5466991596464
2008-01-01	86.5590073943854
2008-04-01	87.7889916986331
2008-07-01	87.4043681457172
2008-10-01	87.3251176352930
2009-01-01	85.6473119569303
2009-04-01	86.8948368920472
2009-07-01	86.0050587756677
2009-10-01	86.4649521929422
2010-01-01	85.7103139094273
2010-04-01	87.3488891029556
2010-07-01	86.9407453598721
2010-10-01	87.1057047177329
2011-01-01	86.3427852379367
2011-04-01	87.8176991437562
2011-07-01	87.6844485481861
2011-10-01	87.9271958752493
2012-01-01	86.9483547105384
2012-04-01	88.1831484096360
2012-07-01	88.1447175077320
2012-10-01	88.0235281456834
2013-01-01	86.9229337649806
2013-04-01	88.2243698723516
2013-07-01	87.9862099005270
2013-10-01	88.4206995235025
2014-01-01	87.9001718717776
2014-04-01	88.5301333578917
2014-07-01	88.5812968235252
2014-10-01	88.5839007593636
2015-01-01	87.6428896023724
2015-04-01	88.3317977918979
2015-07-01	88.3055399104872
2015-10-01	88.3382316977276
2016-01-01	87.4324469905710
2016-04-01	88.0663576566318
2016-07-01	88.1309587241918
2016-10-01	88.1188303480370
2017-01-01	87.2145342321829
2017-04-01	87.8018218871658
2017-07-01	87.8549395346626
2017-10-01	87.8302029195907
2018-01-01	87.1844996594314
2018-04-01	87.4075802015931
2018-07-01	87.0685373042058