Quarter	Percent, Seasonally Adjusted
1999-01-01	55.2176155775115
1999-04-01	55.5103483892528
1999-07-01	55.6700400439345
1999-10-01	55.8676343592513
2000-01-01	56.0097176366173
2000-04-01	56.0607235426591
2000-07-01	56.3083539042337
2000-10-01	56.6642156357080
2001-01-01	56.4751760759324
2001-04-01	56.1534788918710
2001-07-01	56.1812888798145
2001-10-01	55.9521221513852
2002-01-01	56.2091440646464
2002-04-01	56.2174294430453
2002-07-01	56.1527722342109
2002-10-01	56.2820211864062
2003-01-01	56.5428818440656
2003-04-01	57.0844009268246
2003-07-01	57.1736367403238
2003-10-01	57.2519996016898
2004-01-01	57.0502177467588
2004-04-01	56.6690396522596
2004-07-01	56.5356511758054
2004-10-01	56.7862822039221
2005-01-01	56.8620601666581
2005-04-01	56.8153225497137
2005-07-01	57.0202760342102
2005-10-01	56.9670897018896
2006-01-01	57.3503324879266
2006-04-01	57.4435031808023
2006-07-01	57.1869100720454
2006-10-01	57.4234697115888
2007-01-01	57.3960515054372
2007-04-01	57.1916124020877
2007-07-01	56.9417776400066
2007-10-01	56.6186013742661
2008-01-01	56.4936717251295
2008-04-01	56.2643679722075
2008-07-01	56.5349704267299
2008-10-01	56.2385344833489
2009-01-01	55.5177627846199
2009-04-01	55.2648847990852
2009-07-01	54.5819382334883
2009-10-01	54.7981571629627
2010-01-01	54.8727930043535
2010-04-01	54.8600693663822
2010-07-01	55.0274737124989
2010-10-01	55.0326538325553
2011-01-01	55.1202662404986
2011-04-01	55.4063814265383
2011-07-01	55.5020704645035
2011-10-01	55.7011260730517
2012-01-01	55.9755564534784
2012-04-01	56.4752163385556
2012-07-01	57.0507278382891
2012-10-01	57.1319186768785
2013-01-01	56.8831373931726
2013-04-01	57.8683515718319
2013-07-01	58.3302973236890
2013-10-01	59.2141837181411
2014-01-01	61.2971745817839
2014-04-01	61.2540215588044
2014-07-01	62.0920412230422
2014-10-01	62.4850623846098
2015-01-01	63.0267152727993
2015-04-01	63.6935121893817
2015-07-01	64.3554771064107
2015-10-01	64.7062740050276
2016-01-01	65.5918496986187
2016-04-01	66.3693821946327
2016-07-01	66.7627909489293
2016-10-01	67.3806259934176
2017-01-01	67.5968927864144
2017-04-01	68.0463905714107
2017-07-01	68.3751311251748
2017-10-01	68.6777431991536
2018-01-01	69.1027062853552
2018-04-01	69.2922791618077