Quarter	Percent, Seasonally Adjusted
1998-01-01	67.9559064708390
1998-04-01	67.5152754874487
1998-07-01	67.0139200253143
1998-10-01	66.7466143373873
1999-01-01	66.1148316745805
1999-04-01	65.6559797837177
1999-07-01	65.4052896932138
1999-10-01	65.3475689586242
2000-01-01	65.0631677941548
2000-04-01	64.9230371521480
2000-07-01	65.0192648715823
2000-10-01	64.9596183086001
2001-01-01	65.3302106079594
2001-04-01	64.9948063790027
2001-07-01	64.8480454052710
2001-10-01	64.9295367907144
2002-01-01	65.1700002880669
2002-04-01	65.4834635800186
2002-07-01	65.5222048318457
2002-10-01	65.5125920065318
2003-01-01	65.2847864144199
2003-04-01	64.8789987574977
2003-07-01	64.4511437209898
2003-10-01	64.2022146980018
2004-01-01	64.0500413583856
2004-04-01	64.0869196556347
2004-07-01	64.2069083769434
2004-10-01	64.2598714780107
2005-01-01	64.4623072978473
2005-04-01	64.6833812395522
2005-07-01	65.0269093325986
2005-10-01	64.9840156093706
2006-01-01	65.1527695148706
2006-04-01	65.2728779708696
2006-07-01	65.2395825987290
2006-10-01	65.4187811429005
2007-01-01	65.8693804067952
2007-04-01	66.0472992042781
2007-07-01	66.1536439204754
2007-10-01	66.3138170170587
2008-01-01	66.4386130690162
2008-04-01	66.6769992716982
2008-07-01	66.5683579401024
2008-10-01	66.6154150438926
2009-01-01	65.9232142677004
2009-04-01	65.4304690265395
2009-07-01	65.0529455674032
2009-10-01	65.0503267918768
2010-01-01	64.5205674957810
2010-04-01	64.8909749882195
2010-07-01	65.2513968268502
2010-10-01	65.3343796991564
2011-01-01	65.3956719700278
2011-04-01	65.7026409577311
2011-07-01	65.9403781889554
2011-10-01	65.9334268437521
2012-01-01	65.9811442895499
2012-04-01	66.4380127656316
2012-07-01	66.8741786907253
2012-10-01	66.8690703468301
2013-01-01	67.1894366162987
2013-04-01	67.7930288748025
2013-07-01	67.8683745407971
2013-10-01	68.0981578834720
2014-01-01	68.4159024399882
2014-04-01	68.6680267612754
2014-07-01	69.1777252804612
2014-10-01	69.5943370191319
2015-01-01	69.7285636421172
2015-04-01	70.1647276560789
2015-07-01	70.3668502469461
2015-10-01	70.6520831224380
2016-01-01	71.3378726014991
2016-04-01	71.7492785011355
2016-07-01	72.0792161443414
2016-10-01	72.7573859267168
2017-01-01	73.0951982280668
2017-04-01	73.3343496987745
2017-07-01	73.9886008454037
2017-10-01	74.1679019606005
2018-01-01	74.4617846450301
2018-04-01	74.7561584490429