Quarter	Percent
1999-07-01	70.7731923982143
1999-10-01	70.3757187989812
2000-01-01	65.8166936662314
2000-04-01	69.5616403980512
2000-07-01	69.7528543558298
2000-10-01	69.0662464178064
2001-01-01	64.6286501343125
2001-04-01	71.3799263145572
2001-07-01	71.7418072031296
2001-10-01	71.2037258209430
2002-01-01	68.5581713518673
2002-04-01	72.8787409008510
2002-07-01	73.8275529409627
2002-10-01	73.4876338001762
2003-01-01	68.2103409556563
2003-04-01	71.6619169442005
2003-07-01	71.2492793264818
2003-10-01	72.1399778286483
2004-01-01	69.6125688547477
2004-04-01	72.5923345622225
2004-07-01	72.0558372433301
2004-10-01	73.0677718537506
2005-01-01	69.8715887427881
2005-04-01	73.8042941426331
2005-07-01	72.6196835795958
2005-10-01	72.7489170773961
2006-01-01	69.9535278309453
2006-04-01	73.8155812935094
2006-07-01	73.1126700837830
2006-10-01	73.8495682229872
2007-01-01	72.1120949702934
2007-04-01	76.1811607019984
2007-07-01	75.7683434912869
2007-10-01	74.9938012817560
2008-01-01	72.3529038926156
2008-04-01	75.5802600565274
2008-07-01	74.9933856423748
2008-10-01	74.2902931127934
2009-01-01	71.7877622715872
2009-04-01	74.8561922730173
2009-07-01	75.1882155410246
2009-10-01	75.5176580083672
2010-01-01	71.8860361083254
2010-04-01	76.2800445057382
2010-07-01	76.0584651536500
2010-10-01	75.8231986895702
2011-01-01	74.1151951482394
2011-04-01	77.9580551788774
2011-07-01	76.5354444958567
2011-10-01	77.5611122241608
2012-01-01	74.6496269603806
2012-04-01	78.8332193121874
2012-07-01	77.5827357669973
2012-10-01	77.6371528499144
2013-01-01	74.4889477465905
2013-04-01	79.3209386783418
2013-07-01	79.4419328355569
2013-10-01	79.4560281487052
2014-01-01	77.3611375034976
2014-04-01	81.2842929123529
2014-07-01	80.1046835374833
2014-10-01	79.9115169147940
2015-01-01	77.9243018726330
2015-04-01	79.9118435714711
2015-07-01	79.3402070482538
2015-10-01	79.1406053663034
2016-01-01	76.7655277302753
2016-04-01	79.0488431926588
2016-07-01	79.9772616365397
2016-10-01	80.5490632274638
2017-01-01	78.9872039926083
2017-04-01	81.5130267664059
2017-07-01	80.5822645486703
2017-10-01	80.5898729323320
2018-01-01	78.1197022060261
2018-04-01	80.4503380817659
2018-07-01	79.7344018528115