Quarter	Percent
2005-01-01	77.1992680639060
2005-04-01	76.4157814871017
2005-07-01	77.7710725223662
2005-10-01	76.9249202474202
2006-01-01	78.2118822132221
2006-04-01	79.3882272031011
2006-07-01	78.8992082825822
2006-10-01	80.0452819164476
2007-01-01	79.7476876244000
2007-04-01	80.6137457339102
2007-07-01	79.6257942713837
2007-10-01	80.9208181882974
2008-01-01	81.5536876355748
2008-04-01	81.4044333801213
2008-07-01	80.7337877209866
2008-10-01	81.3111495469448
2009-01-01	81.4543579164518
2009-04-01	81.3609430235630
2009-07-01	81.6586416624430
2009-10-01	81.3810048507416
2010-01-01	82.0378634380400
2010-04-01	81.2835028305195
2010-07-01	82.0479957033348
2010-10-01	83.3883625227294
2011-01-01	83.1237785783240
2011-04-01	83.1772690945093
2011-07-01	82.1906303630765
2011-10-01	83.2201005983456
2012-01-01	84.6912726058119
2012-04-01	85.3292015890592
2012-07-01	84.4072251700079
2012-10-01	85.6013210610978
2013-01-01	85.8312155873374
2013-04-01	85.4895770716662
2013-07-01	85.1833135806996
2013-10-01	86.1675397660245
2014-01-01	85.7921712976904
2014-04-01	86.9291225157964
2014-07-01	85.4197339709324
2014-10-01	84.9103395674199
2015-01-01	85.3807389925770
2015-04-01	85.7451557603194
2015-07-01	85.4503651079399
2015-10-01	86.0036111852394
2016-01-01	84.8331390718484
2016-04-01	84.9585067409994
2016-07-01	84.7862121194073
2016-10-01	84.7396623986493
2017-01-01	85.3664412902075
2017-04-01	86.2045904831268
2017-07-01	85.9268510962834
2017-10-01	87.3466486303765
2018-01-01	87.0232982290592
2018-04-01	87.1641726916615
2018-07-01	86.1189946740446