Quarter	Percent, Seasonally Adjusted
1998-01-01	55.2847672283678
1998-04-01	55.9253027765513
1998-07-01	56.2197229125861
1998-10-01	56.6244585112470
1999-01-01	56.8165124538528
1999-04-01	57.0202006531109
1999-07-01	57.2509970589324
1999-10-01	57.2688482893120
2000-01-01	57.3441566243128
2000-04-01	57.7121318153476
2000-07-01	58.1779630371515
2000-10-01	58.4887524079153
2001-01-01	59.0035208841175
2001-04-01	59.1449611031934
2001-07-01	59.6471999792820
2001-10-01	59.5752822494438
2002-01-01	60.0396051964842
2002-04-01	60.3253968282419
2002-07-01	60.5854975840428
2002-10-01	60.4244204903527
2003-01-01	60.6116677407526
2003-04-01	61.2095038785719
2003-07-01	61.2282176549047
2003-10-01	60.6981362754988
2004-01-01	64.2799097436782
2004-04-01	63.5350805288053
2004-07-01	63.5259376970587
2004-10-01	64.1127707302976
2005-01-01	63.8362805982009
2005-04-01	63.6204792398274
2005-07-01	63.3114748615882
2005-10-01	63.9994372707420
2006-01-01	64.3517181747120
2006-04-01	64.5192844858616
2006-07-01	64.1412955007459
2006-10-01	64.4164424732962
2007-01-01	63.4471258414276
2007-04-01	63.6486246056186
2007-07-01	64.6511390445734
2007-10-01	64.7491421959614
2008-01-01	65.4386570870234
2008-04-01	65.5075436598495
2008-07-01	65.3586198505128
2008-10-01	64.8605358952670
2009-01-01	64.6242160003769
2009-04-01	64.5310981134491
2009-07-01	64.5461438772406
2009-10-01	64.5459300142246
2010-01-01	64.3970081836358
2010-04-01	64.6033736435165
2010-07-01	64.3812110151987
2010-10-01	64.5634914675224
2011-01-01	64.4464011430301
2011-04-01	64.4219266636367
2011-07-01	64.6863107943999
2011-10-01	65.1376442314027
2012-01-01	66.1725251000320
2012-04-01	66.6554938722180
2012-07-01	66.5455951854765
2012-10-01	66.5248429399928
2013-01-01	66.6937433935937
2013-04-01	66.1197757621199
2013-07-01	65.7057166502188
2013-10-01	65.9375067758363
2014-01-01	66.3246658555840
2014-04-01	65.8883977949070
2014-07-01	66.3531596347891
2014-10-01	66.9191445781968
2015-01-01	66.0955937870965
2015-04-01	66.0336818338641
2015-07-01	65.6123516652510
2015-10-01	65.8142267654127
2016-01-01	65.9373443361020
2016-04-01	66.9376699308227
2016-07-01	67.0572932290382
2016-10-01	67.1676464249567
2017-01-01	67.3530802510518
2017-04-01	67.0375675637179
2017-07-01	67.6437128407392
2017-10-01	67.1917190529262
2018-01-01	67.4214739260348
2018-04-01	68.0270528651696