Quarter	Percent, Seasonally Adjusted
1999-01-01	81.2985447934026
1999-04-01	81.1194745447002
1999-07-01	80.4998563830031
1999-10-01	80.4110427317031
2000-01-01	79.9074758444960
2000-04-01	80.5820946773988
2000-07-01	81.2509352152929
2000-10-01	81.4258357928623
2001-01-01	80.1109054178925
2001-04-01	80.1642585000077
2001-07-01	80.3046105416625
2001-10-01	80.4105120508620
2002-01-01	79.9756981702960
2002-04-01	80.1423071063303
2002-07-01	80.1518386864484
2002-10-01	79.6963928159319
2003-01-01	80.1646382389929
2003-04-01	79.5716061841354
2003-07-01	79.7910265117799
2003-10-01	79.0415262401938
2004-01-01	79.6736175832844
2004-04-01	79.8337323576124
2004-07-01	79.8786286838701
2004-10-01	79.4143163769686
2005-01-01	79.8776992331634
2005-04-01	79.9910719076532
2005-07-01	79.5561157817291
2005-10-01	79.8769519561480
2006-01-01	80.7206287163330
2006-04-01	80.5209177981095
2006-07-01	81.5744662333725
2006-10-01	82.0835117884783
2007-01-01	81.5096500846351
2007-04-01	81.0546459424499
2007-07-01	80.1263476599420
2007-10-01	80.4510989235345
2008-01-01	80.8368155151508
2008-04-01	82.0855876568388
2008-07-01	82.2538680230572
2008-10-01	81.2187437093272
2009-01-01	79.5149384948423
2009-04-01	78.0893351974032
2009-07-01	77.8091879747714
2009-10-01	76.4286462724089
2010-01-01	75.8887737663010
2010-04-01	74.9702160372425
2010-07-01	75.3993134936285
2010-10-01	76.0597345136949
2011-01-01	76.0107465464745
2011-04-01	75.7118579242292
2011-07-01	75.9074426525175
2011-10-01	75.8471104390866
2012-01-01	75.6309839238346
2012-04-01	74.9558154489936
2012-07-01	74.6173294110671
2012-10-01	75.4154493585174
2013-01-01	75.6879642605345
2013-04-01	75.2067864831296
2013-07-01	74.2413370841468
2013-10-01	74.8783857917068
2014-01-01	75.0727375268274
2014-04-01	75.6199544555045
2014-07-01	76.2596074526919
2014-10-01	76.0914974555772
2015-01-01	76.3266640424442
2015-04-01	76.5141104248699
2015-07-01	76.5175224955003
2015-10-01	77.0449358879021
2016-01-01	77.6667015730640
2016-04-01	77.7608502800359
2016-07-01	77.8957013887808
2016-10-01	77.5004933229130
2017-01-01	76.3671649411930
2017-04-01	76.8489459009359
2017-07-01	76.7658280631434
2017-10-01	77.4528041791106
2018-01-01	77.5085730670810
2018-04-01	78.1598958547235