Quarter	Percent, Seasonally Adjusted
1999-04-01	55.0427545647899
1999-07-01	55.4836235314517
1999-10-01	55.7262819589979
2000-01-01	55.9789592104925
2000-04-01	56.3617198225503
2000-07-01	56.3719586307558
2000-10-01	56.6206936789916
2001-01-01	56.7265952645010
2001-04-01	56.7728223460430
2001-07-01	57.3630348497076
2001-10-01	57.4208393367090
2002-01-01	57.7727217894427
2002-04-01	57.8390374933920
2002-07-01	57.6635689538310
2002-10-01	57.7980016723524
2003-01-01	57.9298168033222
2003-04-01	58.1823187375157
2003-07-01	58.4873960170110
2003-10-01	58.4635425040060
2004-01-01	58.5574165882138
2004-04-01	58.5932079843225
2004-07-01	58.9545561324375
2004-10-01	59.6926914740028
2005-01-01	60.0684634605930
2005-04-01	60.7026805967053
2005-07-01	61.0438929304926
2005-10-01	61.2560330657442
2006-01-01	61.5539409743363
2006-04-01	61.5675780575889
2006-07-01	62.1454105336109
2006-10-01	62.2768378525777
2007-01-01	65.9092670581855
2007-04-01	66.4396824657216
2007-07-01	66.2199943418290
2007-10-01	66.2723398099410
2008-01-01	66.2667640086726
2008-04-01	65.9977234554159
2008-07-01	66.0724331617070
2008-10-01	65.7222767742337
2009-01-01	65.6382607539900
2009-04-01	65.4953091374708
2009-07-01	65.2796928021830
2009-10-01	64.8796591404440
2010-01-01	64.5677961451952
2010-04-01	64.6166291235934
2010-07-01	64.3418096597066
2010-10-01	64.5798718827188
2011-01-01	64.3377828529968
2011-04-01	64.4559629364379
2011-07-01	64.3866978313711
2011-10-01	64.5367090856289
2012-01-01	64.6530356072395
2012-04-01	64.2932976157724
2012-07-01	64.5056553072210
2012-10-01	64.6480879019680
2013-01-01	65.0617403959681
2013-04-01	65.6145901745712
2013-07-01	65.3163110281545
2013-10-01	65.4127745077428
2014-01-01	65.3991036972354
2014-04-01	64.9201100901426
2014-07-01	65.3188537189390
2014-10-01	65.0563501077588
2015-01-01	65.0033544407212
2015-04-01	65.1284609905740
2015-07-01	65.1081714946581
2015-10-01	65.5973365832171
2016-01-01	65.7382187366458
2016-04-01	66.5155921178502
2016-07-01	66.5063882438193
2016-10-01	66.3646499766686
2017-01-01	66.8056375633919
2017-04-01	66.2633849864038
2017-07-01	66.5777459868028
2017-10-01	66.8421104804526
2018-01-01	66.7237040094698
2018-04-01	67.1889965240756