Quarter	Percent, Seasonally Adjusted
1999-01-01	64.4383526286147
1999-04-01	64.3914103262887
1999-07-01	65.3891512804906
1999-10-01	65.6688458036669
2000-01-01	65.6792215638696
2000-04-01	66.5514674257198
2000-07-01	67.1898499640250
2000-10-01	67.3000947506173
2001-01-01	69.0246842395157
2001-04-01	69.9914240517796
2001-07-01	70.2799879214300
2001-10-01	71.1398610466746
2002-01-01	70.9869007569492
2002-04-01	70.7094501251001
2002-07-01	70.6975053539837
2002-10-01	70.5679983873830
2003-01-01	71.0820336683365
2003-04-01	72.5562638397220
2003-07-01	73.1528510319945
2003-10-01	74.0365449658870
2004-01-01	74.5505460410816
2004-04-01	75.5500752919923
2004-07-01	76.5071939803034
2004-10-01	76.0622820008664
2005-01-01	75.7491440114203
2005-04-01	76.0302417812920
2005-07-01	76.3705326139327
2005-10-01	76.7965095335201
2006-01-01	76.5094102361983
2006-04-01	76.9598300572254
2006-07-01	76.4029527402739
2006-10-01	77.4525915437113
2007-01-01	77.6356292486696
2007-04-01	78.4851741285800
2007-07-01	78.0079271604651
2007-10-01	78.5700777351040
2008-01-01	78.8526007867907
2008-04-01	79.0888880849382
2008-07-01	78.4323926023042
2008-10-01	77.8642462997566
2009-01-01	79.1359707135385
2009-04-01	78.2946966574072
2009-07-01	78.3665983997408
2009-10-01	78.3042062831014
2010-01-01	78.0114965670309
2010-04-01	77.9350474948904
2010-07-01	78.2572038755036
2010-10-01	77.9426308080367
2011-01-01	78.5625825808508
2011-04-01	78.5739598490706
2011-07-01	78.4198042355030
2011-10-01	78.5897624007457
2012-01-01	77.4625500646547
2012-04-01	76.8970001555774
2012-07-01	76.1887074572414
2012-10-01	75.9224392239385
2013-01-01	76.1522190972976
2013-04-01	76.2483651132073
2013-07-01	76.3533269153966
2013-10-01	76.7372436941632
2014-01-01	75.0952468001570
2014-04-01	73.8451752954900
2014-07-01	74.0160212608360
2014-10-01	73.5564885312338
2015-01-01	73.1697050509661
2015-04-01	72.2440399879821
2015-07-01	72.3350312989891
2015-10-01	72.2864700690020
2016-01-01	72.1154405765714
2016-04-01	72.4454262582871
2016-07-01	71.2526910188790
2016-10-01	71.1544934162667
2017-01-01	71.1305682361611
2017-04-01	71.0950933420081
2017-07-01	72.5161048450740
2017-10-01	72.4866372437128
2018-01-01	73.3331820551464
2018-04-01	72.5759181922088