Quarter	Percent, Seasonally Adjusted
1998-04-01	78.4466019417476
1999-04-01	78.8622270153680
2000-04-01	76.9614274468643
2001-04-01	80.9851965288412
2002-04-01	77.2783709957785
2003-04-01	77.7323062108811
2004-04-01	76.6261113710810
2005-04-01	74.8743718592965
2006-04-01	74.9107142857143
2007-04-01	76.3616317530320
2008-04-01	76.9868995633188
2009-04-01	77.0779220779221
2010-01-01	74.7643224127041
2010-04-01	75.7574011621674
2010-07-01	75.5047949574319
2010-10-01	76.3544130496348
2011-01-01	76.4151727398526
2011-04-01	76.4145490237005
2011-07-01	76.8513927644476
2011-10-01	76.5576830194942
2012-01-01	76.2043710117604
2012-04-01	76.5965437647285
2012-07-01	77.2086485348447
2012-10-01	77.0728608798346
2013-01-01	77.3240481699934
2013-04-01	77.2870517130860
2013-07-01	77.1126929459921
2013-10-01	77.4246622253965
2014-01-01	76.3343183619240
2014-04-01	76.2380516492127
2014-07-01	76.0698436033167
2014-10-01	76.9747700729872
2015-01-01	77.3578676900614
2015-04-01	77.0758081455746
2015-07-01	75.4734590868465
2015-10-01	76.7080909562979
2016-01-01	76.2072550493590
2016-04-01	77.0302882642011
2016-07-01	77.7599115930572
2016-10-01	77.8817919123826
2017-01-01	77.8702276486404
2017-04-01	78.6791173587054
2017-07-01	78.3785344285309
2017-10-01	79.4396995630379
2018-01-01	78.3689137544628
2018-04-01	79.8794506952266