Quarter	Percent, Seasonally Adjusted
1998-04-01	78.5000000000000
1999-04-01	77.7000000000000
2000-04-01	78.0000000000000
2001-04-01	79.5000000000000
2002-04-01	80.6000000000000
2003-04-01	80.5000000000000
2004-04-01	80.8000000000000
2005-04-01	81.3000000000000
2006-04-01	81.2000000000000
2007-04-01	81.9000000000000
2008-04-01	83.6000000000000
2009-04-01	83.9000000000000
2010-01-01	81.5390231741540
2010-04-01	82.0018139509030
2010-07-01	82.1167522472476
2010-10-01	82.1178629135770
2011-01-01	82.7335241538477
2011-04-01	82.6519052629026
2011-07-01	82.4779696543254
2011-10-01	83.5528350977418
2012-01-01	83.3094009057117
2012-04-01	83.5458072910756
2012-07-01	83.7264817358629
2012-10-01	83.8926470694094
2013-01-01	83.5709381716966
2013-04-01	83.5211607919362
2013-07-01	83.4853118872611
2013-10-01	83.6851418815818
2014-01-01	84.1419965294204
2014-04-01	84.4563294895983
2014-07-01	84.6930449599812
2014-10-01	85.6856669898158
2015-01-01	84.9293440107429
2015-04-01	85.0125483138072
2015-07-01	84.4596186539206
2015-10-01	84.9059024776410
2016-01-01	86.5165583969817
2016-04-01	85.0237058442966
2016-07-01	84.8078319478980
2016-10-01	85.7343980297147
2017-01-01	86.0205015082411
2017-04-01	85.2205286598612
2017-07-01	85.3152134502700
2017-10-01	85.6439042721477
2018-01-01	86.0433786938757
2018-04-01	86.0600503554764