Quarter	Percent, Seasonally Adjusted
1999-01-01	61.0215192638654
1999-04-01	59.6074877563800
1999-07-01	58.8284314796064
1999-10-01	58.2648643615699
2000-01-01	57.7587774091224
2000-04-01	57.3898481491032
2000-07-01	57.5789927581334
2000-10-01	57.4536700131567
2001-01-01	57.2221561101886
2001-04-01	57.5629376592911
2001-07-01	57.4587672423049
2001-10-01	57.5367151976434
2002-01-01	57.8738794881380
2002-04-01	57.5160865973344
2002-07-01	57.5975071016045
2002-10-01	58.1872853562771
2003-01-01	58.2664776755366
2003-04-01	58.9835817544175
2003-07-01	58.9678541545261
2003-10-01	58.5404194988903
2004-01-01	58.3001995323692
2004-04-01	58.6513498816658
2004-07-01	59.0451043681099
2004-10-01	59.1723536624801
2005-01-01	59.5171310984878
2005-04-01	59.8201331212250
2005-07-01	60.3934044579102
2005-10-01	61.1441483409377
2006-01-01	61.9033401879537
2006-04-01	62.4172104054670
2006-07-01	62.5407246759908
2006-10-01	62.7278817433372
2007-01-01	63.0279152096110
2007-04-01	63.3203899745422
2007-07-01	63.8795071455827
2007-10-01	64.4133033936022
2008-01-01	64.6215889381638
2008-04-01	64.6905396848027
2008-07-01	65.8723591790332
2008-10-01	65.8276506140010
2009-01-01	64.4658855190971
2009-04-01	63.4147901258590
2009-07-01	62.5529493898869
2009-10-01	61.4274469842723
2010-01-01	60.4616180235926
2010-04-01	60.6951290033142
2010-07-01	60.6292793625864
2010-10-01	61.0677138267777
2011-01-01	61.1409303741433
2011-04-01	61.5331662937774
2011-07-01	61.4536481370519
2011-10-01	61.5631571716084
2012-01-01	61.9953295319250
2012-04-01	61.7803660127831
2012-07-01	61.8413372284790
2012-10-01	61.5489024352423
2013-01-01	61.8704071626327
2013-04-01	61.3975613132426
2013-07-01	61.0037800922297
2013-10-01	60.7774339455372
2014-01-01	61.3980418486001
2014-04-01	61.8404693430263
2014-07-01	62.5185346936032
2014-10-01	63.1215796217311
2015-01-01	63.1906269970791
2015-04-01	63.5316654830503
2015-07-01	63.8481799647083
2015-10-01	64.2857537163923
2016-01-01	64.6421415773628
2016-04-01	65.1594979259603
2016-07-01	65.2494390465373
2016-10-01	65.3780708373292
2017-01-01	65.3521553485007
2017-04-01	65.3896661892355
2017-07-01	65.4920154213018
2017-10-01	65.6564642820029
2018-01-01	66.1992880040069
2018-04-01	66.7290208827233