Quarter	Percent, Seasonally Adjusted
1998-04-01	75.4603907859417
1999-04-01	75.1185721417873
2000-04-01	75.5608175473579
2001-04-01	76.8187192731346
2002-04-01	78.0267392919039
2003-04-01	77.2825217016561
2004-04-01	77.0835890511845
2005-04-01	77.5250672536072
2006-04-01	77.5624619134674
2007-04-01	78.4921453266210
2008-04-01	80.5994354015256
2009-04-01	80.4487179487179
2010-01-01	77.5763502854328
2010-04-01	77.8615244245564
2010-07-01	77.8613481605553
2010-10-01	78.3129022555305
2011-01-01	78.9069632253327
2011-04-01	79.4013338317448
2011-07-01	78.3883324255707
2011-10-01	79.8790898124008
2012-01-01	79.7108356534078
2012-04-01	79.7830267878720
2012-07-01	79.9852442745008
2012-10-01	80.0597686941215
2013-01-01	79.3079196706024
2013-04-01	79.7391321212330
2013-07-01	79.7709356681330
2013-10-01	79.9016540536984
2014-01-01	79.7335058274803
2014-04-01	80.5960332969051
2014-07-01	80.7530890768994
2014-10-01	81.5374085152488
2015-01-01	81.1899657791742
2015-04-01	80.9763795922901
2015-07-01	80.3555656322501
2015-10-01	81.0308482930892
2016-01-01	81.7616640259298
2016-04-01	80.9515000176896
2016-07-01	80.8101868448825
2016-10-01	81.6657271294563
2017-01-01	81.3476106993465
2017-04-01	81.0089937428300
2017-07-01	80.9765265151226
2017-10-01	81.4294247075969
2018-01-01	81.4004722857608
2018-04-01	81.1328550392994