Quarter	Percent, Seasonally Adjusted
1998-01-01	51.1882379457570
1998-04-01	51.3000813958080
1998-07-01	51.6871850028357
1998-10-01	51.7899758836843
1999-01-01	52.5053326354385
1999-04-01	51.8686061507055
1999-07-01	51.5515051646011
1999-10-01	51.5826509631270
2000-01-01	51.9201510203351
2000-04-01	52.4814707647658
2000-07-01	52.9248615679321
2000-10-01	53.3731718826738
2001-01-01	53.4513373587843
2001-04-01	52.6690450231813
2001-07-01	52.7031439042800
2001-10-01	52.4514576196558
2002-01-01	53.3824766869431
2002-04-01	54.3808541802760
2002-07-01	54.9168953137580
2002-10-01	55.7257772600469
2003-01-01	55.8929360255218
2003-04-01	56.3892325940462
2003-07-01	56.7971043109244
2003-10-01	56.9038800524219
2004-01-01	57.3856084291023
2004-04-01	57.4821950338133
2004-07-01	57.7415854229541
2004-10-01	58.1245020126200
2005-01-01	58.1820650206099
2005-04-01	58.3671577804002
2005-07-01	58.4090117550143
2005-10-01	59.3808768018543
2006-01-01	59.9501198612138
2006-04-01	60.3123169833269
2006-07-01	61.0929310260530
2006-10-01	60.9390987730856
2007-01-01	60.6150596481991
2007-04-01	60.8348691430195
2007-07-01	60.9427389513411
2007-10-01	61.0521237726901
2008-01-01	61.6252274152581
2008-04-01	61.8348909664411
2008-07-01	62.1737174170463
2008-10-01	62.2541481484186
2009-01-01	62.3595780626544
2009-04-01	62.4100065446215
2009-07-01	62.1819529290899
2009-10-01	62.3038411290500
2010-01-01	61.7941472681803
2010-04-01	61.6458347050282
2010-07-01	60.9654917605360
2010-10-01	60.0849721855433
2011-01-01	59.4545284377198
2011-04-01	57.9819581007150
2011-07-01	57.2293464575443
2011-10-01	56.3820691452013
2012-01-01	55.4263682810896
2012-04-01	54.0589080978222
2012-07-01	53.1207001065856
2012-10-01	52.9795652094156
2013-01-01	52.0546281770843
2013-04-01	51.4171299268613
2013-07-01	51.0157397097550
2013-10-01	50.9578838171054
2014-01-01	52.4428046805180
2014-04-01	52.4662696210898
2014-07-01	53.4159677545235
2014-10-01	54.0334913524388
2015-01-01	54.3171432509787
2015-04-01	55.3425734193755
2015-07-01	55.6440672217490
2015-10-01	56.2595801520600
2016-01-01	55.9447489607208
2016-04-01	55.9300029447885
2016-07-01	56.0887702622731
2016-10-01	55.7715291952896
2017-01-01	56.5280151632766
2017-04-01	57.5574832832896
2017-07-01	57.5376913385061
2017-10-01	57.3694285835840
2018-01-01	57.3775577581269
2018-04-01	58.1148641158194