Quarter	Percent, Seasonally Adjusted
1998-01-01	59.4723941843720
1998-04-01	59.7497420032629
1998-07-01	60.3266748589482
1998-10-01	60.6113437940961
1999-01-01	61.7379174371208
1999-04-01	61.5440699306744
1999-07-01	61.2333824601602
1999-10-01	61.4497091959656
2000-01-01	61.5816256407752
2000-04-01	61.9609640119446
2000-07-01	62.3085695945357
2000-10-01	62.3136791874634
2001-01-01	62.4021194239309
2001-04-01	61.5283844386916
2001-07-01	61.4567464395794
2001-10-01	61.5717035716322
2002-01-01	62.2975535119870
2002-04-01	63.3284156043534
2002-07-01	63.9112699759366
2002-10-01	64.6466558269802
2003-01-01	64.6695690480696
2003-04-01	65.0570537063730
2003-07-01	65.6762427715370
2003-10-01	66.1042678008326
2004-01-01	67.3114856090742
2004-04-01	67.4702590644356
2004-07-01	67.9484408877450
2004-10-01	68.1585637735863
2005-01-01	68.0333484550618
2005-04-01	68.3587225775796
2005-07-01	68.3114951109712
2005-10-01	68.8643843896474
2006-01-01	68.7853280941007
2006-04-01	69.0760071990580
2006-07-01	69.6624069458393
2006-10-01	69.4662027261347
2007-01-01	69.2963865709755
2007-04-01	69.2852732894693
2007-07-01	69.0902264411371
2007-10-01	69.0399850732018
2008-01-01	69.3015277112195
2008-04-01	69.2761875722238
2008-07-01	69.6124927432428
2008-10-01	69.9781247219627
2009-01-01	70.6044377366947
2009-04-01	70.9919699275694
2009-07-01	71.2656183735898
2009-10-01	71.7198192085788
2010-01-01	71.9887604000230
2010-04-01	72.4262425345440
2010-07-01	72.4342444618812
2010-10-01	72.5715537241359
2011-01-01	72.6937758415869
2011-04-01	72.0982102466570
2011-07-01	72.6566016480902
2011-10-01	73.7425055198801
2012-01-01	73.7890079358170
2012-04-01	73.7602185629744
2012-07-01	74.0115433418947
2012-10-01	74.3831349721942
2013-01-01	73.9568763222088
2013-04-01	74.5175542189178
2013-07-01	74.5185575256827
2013-10-01	74.1425777443225
2014-01-01	74.9895089727307
2014-04-01	75.2936252984866
2014-07-01	75.7746779079368
2014-10-01	76.2839949179703
2015-01-01	76.9229652769925
2015-04-01	77.6555579169348
2015-07-01	77.9535232491074
2015-10-01	78.1683899170346
2016-01-01	78.2015780809992
2016-04-01	77.7792136589960
2016-07-01	77.8921862352405
2016-10-01	77.1126231805396
2017-01-01	76.8578689363932
2017-04-01	77.5306291594043
2017-07-01	76.9231602818133
2017-10-01	76.6036487851039
2018-01-01	76.3125731632350
2018-04-01	76.7760395898564