Quarter	Percent, Seasonally Adjusted
1998-04-01	16.6780251400878
1999-04-01	16.8841454216322
2000-04-01	17.0786601147830
2001-04-01	17.3922767258089
2002-04-01	17.7854952525215
2003-04-01	17.8899250319985
2004-04-01	18.5610312488684
2005-04-01	19.3216449750816
2006-04-01	19.0220674460751
2007-04-01	18.3790840448804
2008-04-01	18.6992152232794
2009-04-01	18.9793206827241
2010-01-01	20.0703520946686
2010-04-01	19.7322140532807
2010-07-01	19.7470127615903
2010-10-01	19.9359069474070
2011-01-01	19.4397700466378
2011-04-01	19.4646885966118
2011-07-01	19.3948568440571
2011-10-01	19.5155462570370
2012-01-01	19.7078635075699
2012-04-01	19.7412391057834
2012-07-01	19.4525281803729
2012-10-01	19.3590502789390
2013-01-01	19.5762952313676
2013-04-01	19.9390092357576
2013-07-01	20.1074978845170
2013-10-01	20.0931293468512
2014-01-01	20.0446832568318
2014-04-01	19.6361757942982
2014-07-01	19.9860342644129
2014-10-01	19.9710114340751
2015-01-01	19.8142580654350
2015-04-01	19.8584463220499
2015-07-01	19.7923366603467
2015-10-01	19.3431811319463
2016-01-01	19.4348195460262
2016-04-01	19.7030379401998
2016-07-01	19.3213779436985
2016-10-01	19.2580357360682
2017-01-01	19.1621719597665
2017-04-01	19.1087101590001
2017-07-01	19.0634682497114
2017-10-01	19.1440465664380
2018-01-01	19.0502189766129
2018-04-01	18.8199915513121