Quarter	Percent, Seasonally Adjusted
1998-04-01	76.0101993837872
1999-04-01	76.0255145193121
2000-04-01	75.9855878546192
2001-04-01	76.0787992495310
2002-04-01	74.5799327892463
2003-04-01	73.8618630843341
2004-04-01	72.9702504868713
2005-04-01	72.1762536137972
2006-04-01	72.8496215860480
2007-04-01	73.5560330793775
2008-04-01	73.3318384213730
2009-04-01	72.4039337669274
2010-01-01	70.5339518068706
2010-04-01	70.9839992853433
2010-07-01	71.2370023266246
2010-10-01	71.2941627829902
2011-01-01	71.7453587691060
2011-04-01	71.5306201575305
2011-07-01	71.7909038548592
2011-10-01	71.4972034874352
2012-01-01	71.4693160357559
2012-04-01	71.4493872488854
2012-07-01	71.2997537786116
2012-10-01	71.0122570859860
2013-01-01	71.0282794123659
2013-04-01	70.7564529357270
2013-07-01	70.5831537714108
2013-10-01	70.7387312375904
2014-01-01	70.4671334134393
2014-04-01	70.6108869821329
2014-07-01	70.6487213741486
2014-10-01	70.9420307805735
2015-01-01	70.9322565884978
2015-04-01	70.6840562256430
2015-07-01	70.5711251038261
2015-10-01	70.7400380062398
2016-01-01	70.8189187613568
2016-04-01	70.7530391404301
2016-07-01	70.9939103588249
2016-10-01	71.0064980571289
2017-01-01	70.8908165297418
2017-04-01	71.2272637466033
2017-07-01	71.0960301026897
2017-10-01	71.0675078123394
2018-01-01	71.0457158433839
2018-04-01	71.2122951935722