Quarter	Percent, Seasonally Adjusted
1998-04-01	51.4233481326717
1999-04-01	51.1284046692607
2000-04-01	50.0635001270003
2001-04-01	53.5873330034636
2002-04-01	52.2611850060460
2003-04-01	54.0686735653810
2004-04-01	54.0559120073327
2005-04-01	55.5630327501122
2006-04-01	56.6336633663366
2007-04-01	58.0631120783460
2008-04-01	59.9784714747040
2009-04-01	59.5685604442546
2010-01-01	57.3173251593187
2010-04-01	57.2413725626746
2010-07-01	56.0978014911909
2010-10-01	57.1777859724390
2011-01-01	57.8368814531564
2011-04-01	58.4990019816619
2011-07-01	57.9995107523737
2011-10-01	59.2205325971144
2012-01-01	59.1533247041373
2012-04-01	60.2306699254107
2012-07-01	60.2392158802478
2012-10-01	59.3887029344474
2013-01-01	60.8866283356666
2013-04-01	61.7490451492787
2013-07-01	61.3616118680216
2013-10-01	61.1654887826255
2014-01-01	61.1601820125040
2014-04-01	62.6114990305027
2014-07-01	62.1358275532818
2014-10-01	62.4296318029232
2015-01-01	62.9994460846274
2015-04-01	63.5232838142628
2015-07-01	63.9856045056671
2015-10-01	65.0670195160826
2016-01-01	65.4417905841475
2016-04-01	66.2386355867812
2016-07-01	65.4518096748756
2016-10-01	66.0474042771465
2017-01-01	64.6607999680569
2017-04-01	65.8474288646932
2017-07-01	65.8193036878512
2017-10-01	66.6665577370029
2018-01-01	66.5704442822981
2018-04-01	66.7338780600662