Quarter	Percent
1999-07-01	77.7594472284052
1999-10-01	77.6635674398202
2000-01-01	76.4721580940387
2000-04-01	77.2431490778254
2000-07-01	77.5240608320798
2000-10-01	77.3801017102187
2001-01-01	75.9214746522307
2001-04-01	77.6864820915646
2001-07-01	77.6314911589371
2001-10-01	77.5622282659085
2002-01-01	77.1269862331095
2002-04-01	78.2454186198731
2002-07-01	78.2435525739396
2002-10-01	78.1668196840963
2003-01-01	77.5755586875500
2003-04-01	78.2934829746223
2003-07-01	78.1606985912171
2003-10-01	78.4681642674285
2004-01-01	78.0605954905548
2004-04-01	78.6628093907841
2004-07-01	78.3663154964818
2004-10-01	78.8331751391395
2005-01-01	77.9500969598787
2005-04-01	78.8344923293851
2005-07-01	78.2412997564529
2005-10-01	78.0235897209711
2006-01-01	77.3984490016902
2006-04-01	78.4044803707321
2006-07-01	78.0287093096342
2006-10-01	77.8700406746221
2007-01-01	77.2796336255963
2007-04-01	78.4418712699562
2007-07-01	78.1044833956616
2007-10-01	77.8101033923527
2008-01-01	76.8718027909823
2008-04-01	78.0341489706000
2008-07-01	77.6557596536246
2008-10-01	77.2013455014818
2009-01-01	76.1538091001598
2009-04-01	77.6494622631858
2009-07-01	77.1309846817916
2009-10-01	76.9298590132677
2010-01-01	76.4528325567028
2010-04-01	77.6374897510692
2010-07-01	77.3445701092720
2010-10-01	77.1987323622210
2011-01-01	76.7825028000682
2011-04-01	77.9277176405058
2011-07-01	77.5106712018416
2011-10-01	77.6148731820364
2012-01-01	77.0453865387222
2012-04-01	78.2693878713691
2012-07-01	78.0217317389175
2012-10-01	77.5921682995219
2013-01-01	76.7829606174987
2013-04-01	78.1466110885360
2013-07-01	78.1628974427408
2013-10-01	78.1870149109066
2014-01-01	78.2819998884686
2014-04-01	79.1145812445216
2014-07-01	79.1694393717480
2014-10-01	78.8503728285349
2015-01-01	78.4640900857752
2015-04-01	79.3007329618262
2015-07-01	79.0842560739556
2015-10-01	78.6742223849094
2016-01-01	78.3428153915842
2016-04-01	79.1081283991815
2016-07-01	79.3492787664995
2016-10-01	78.9088836107497
2017-01-01	78.6932551593351
2017-04-01	79.8618527825608
2017-07-01	79.5942171456870
2017-10-01	79.1208046824578
2018-01-01	78.7692650244819
2018-04-01	79.5433782897759
2018-07-01	79.2041015503365