Quarter	Percent, Seasonally Adjusted
1998-04-01	81.7000000000000
1999-04-01	80.9000000000000
2000-04-01	79.3000000000000
2001-04-01	82.5000000000000
2002-04-01	78.9000000000000
2003-04-01	79.7000000000000
2004-04-01	79.1000000000000
2005-04-01	77.8000000000000
2006-04-01	77.1000000000000
2007-04-01	78.4000000000000
2008-04-01	78.9000000000000
2009-04-01	79.5000000000000
2010-01-01	77.9477655011411
2010-04-01	78.4410530764612
2010-07-01	78.3814591320648
2010-10-01	78.6652284023973
2011-01-01	79.1304928075118
2011-04-01	79.2888449486974
2011-07-01	79.3451323637854
2011-10-01	79.3434555704710
2012-01-01	79.1147003279493
2012-04-01	79.0071148257608
2012-07-01	79.7706558898130
2012-10-01	79.7497928768689
2013-01-01	79.8404748303756
2013-04-01	80.1855100669490
2013-07-01	79.7394284388969
2013-10-01	80.1433649272182
2014-01-01	78.7721707096431
2014-04-01	78.9689664540439
2014-07-01	78.7166620202174
2014-10-01	80.0468336741919
2015-01-01	80.7097022815859
2015-04-01	80.1038105265610
2015-07-01	79.5558348547676
2015-10-01	80.4674634971088
2016-01-01	79.5007989721940
2016-04-01	80.8348435228880
2016-07-01	81.2494451345116
2016-10-01	81.2353932836416
2017-01-01	81.1766974532336
2017-04-01	82.2110896574990
2017-07-01	81.7306623282715
2017-10-01	83.0984939809764
2018-01-01	82.1114252805059
2018-04-01	83.7232368563875