Quarter	Percent, Seasonally Adjusted
1999-01-01	48.1108622684836
1999-04-01	49.3410048478455
1999-07-01	49.4169797864579
1999-10-01	49.6066377940602
2000-01-01	50.2311521376952
2000-04-01	51.2959151350258
2000-07-01	50.4298814105907
2000-10-01	50.2806820414789
2001-01-01	50.5428659414934
2001-04-01	49.5376265785201
2001-07-01	49.6100818846402
2001-10-01	50.9794957825702
2002-01-01	51.6721154676011
2002-04-01	52.5388641737742
2002-07-01	53.0231300130876
2002-10-01	52.8761048194309
2003-01-01	53.9028059323665
2003-04-01	54.8442164209956
2003-07-01	55.2373458962165
2003-10-01	56.3626661372837
2004-01-01	56.4190563730737
2004-04-01	56.5910609919192
2004-07-01	57.3124077165994
2004-10-01	58.2266980648222
2005-01-01	58.8210232417142
2005-04-01	58.9960156213058
2005-07-01	59.9698257480465
2005-10-01	59.2257375397647
2006-01-01	59.3974376604266
2006-04-01	59.6166134448019
2006-07-01	60.5865785960110
2006-10-01	61.7939008273508
2007-01-01	61.6825148721674
2007-04-01	61.6800166279774
2007-07-01	61.1824063937904
2007-10-01	60.0273373615498
2008-01-01	60.6802768964523
2008-04-01	62.4428171877610
2008-07-01	62.6062932650302
2008-10-01	63.0124097530116
2009-01-01	63.2076865683641
2009-04-01	63.6860750937658
2009-07-01	62.3211553898107
2009-10-01	62.2293802957124
2010-01-01	64.0239798624064
2010-04-01	63.7953732288683
2010-07-01	63.3217138118145
2010-10-01	63.2478128430251
2011-01-01	63.2118959354672
2011-04-01	61.4108436744148
2011-07-01	63.4378459803366
2011-10-01	63.2897088514415
2012-01-01	63.0054365876771
2012-04-01	63.5245466566227
2012-07-01	62.3144479098387
2012-10-01	62.8593838784425
2013-01-01	62.0855925591113
2013-04-01	61.8500866872128
2013-07-01	62.4617041106002
2013-10-01	63.4028749900872
2014-01-01	62.1438346555424
2014-04-01	61.7625828589809
2014-07-01	62.2696499993510
2014-10-01	61.6393816299295
2015-01-01	61.1461196282405
2015-04-01	62.3515518709932
2015-07-01	61.7519077685817
2015-10-01	61.7129223861276
2016-01-01	61.1685374869635
2016-04-01	61.0360545365368
2016-07-01	59.6091211700206
2016-10-01	59.1433817385654
2017-01-01	59.3819846224771
2017-04-01	60.1657231320068
2017-07-01	61.2252570749661
2017-10-01	60.9954012054676
2018-01-01	60.8996320340548
2018-04-01	59.8905438719426