Quarter	Percent, Seasonally Adjusted
1999-01-01	61.1132505425760
1999-04-01	61.6210258572742
1999-07-01	62.0916211048663
1999-10-01	62.4134084874570
2000-01-01	62.8802336487239
2000-04-01	63.2690847058127
2000-07-01	63.6758147707704
2000-10-01	64.0527146057766
2001-01-01	64.1975995726210
2001-04-01	64.4583708983418
2001-07-01	64.6622744545500
2001-10-01	64.8252141948628
2002-01-01	64.8060687134076
2002-04-01	64.9950604500086
2002-07-01	64.9089602235074
2002-10-01	65.0163372251962
2003-01-01	65.3694627920205
2003-04-01	65.6232072797133
2003-07-01	65.7246494687419
2003-10-01	65.9219872581068
2004-01-01	65.9455341678699
2004-04-01	65.9965973439551
2004-07-01	66.1496190123263
2004-10-01	66.7818519459231
2005-01-01	67.2589363906677
2005-04-01	67.5093493175755
2005-07-01	68.0419417486444
2005-10-01	68.3378085569949
2006-01-01	68.6561480634905
2006-04-01	68.7245932774855
2006-07-01	68.9516254605194
2006-10-01	69.1126407414959
2007-01-01	69.2224707216615
2007-04-01	69.3809255793139
2007-07-01	69.1415827520526
2007-10-01	68.8665176194355
2008-01-01	68.6397125359654
2008-04-01	67.5154602584691
2008-07-01	66.2664606986713
2008-10-01	64.4447639131955
2009-01-01	61.8992928816963
2009-04-01	60.6918928536833
2009-07-01	59.7855570781895
2009-10-01	59.5432701674387
2010-01-01	59.0771830704259
2010-04-01	59.0511109134148
2010-07-01	58.7900979414015
2010-10-01	58.4290616083750
2011-01-01	58.1933064607698
2011-04-01	57.8339017711322
2011-07-01	57.1663933843213
2011-10-01	56.5091609513462
2012-01-01	55.4796028513767
2012-04-01	54.7068196895785
2012-07-01	54.2492838178867
2012-10-01	53.7455776334516
2013-01-01	53.3265143018880
2013-04-01	53.2386307866354
2013-07-01	53.2214845209366
2013-10-01	53.5058920740827
2014-01-01	53.3759473602069
2014-04-01	54.0680158470411
2014-07-01	54.4983304359121
2014-10-01	54.8151646193826
2015-01-01	55.2467853985069
2015-04-01	55.9569522880745
2015-07-01	56.3401376441176
2015-10-01	56.9046117154926
2016-01-01	57.4721932645782
2016-04-01	57.4278364714258
2016-07-01	57.7466449196627
2016-10-01	58.1224926718388
2017-01-01	58.5376199464064
2017-04-01	58.9198393431114
2017-07-01	59.3470266418010
2017-10-01	59.5163076463085
2018-01-01	59.7562160831183
2018-04-01	60.2738075925421
2018-07-01	60.4422504225101