Quarter	Percent, Seasonally Adjusted
1998-04-01	52.4000000000000
1999-04-01	52.5000000000000
2000-04-01	51.3000000000000
2001-04-01	54.5000000000000
2002-04-01	53.2000000000000
2003-04-01	55.4000000000000
2004-04-01	56.0000000000000
2005-04-01	57.7000000000000
2006-04-01	58.6000000000000
2007-04-01	60.3000000000000
2008-04-01	61.6000000000000
2009-04-01	61.0000000000000
2010-01-01	59.3304568377051
2010-04-01	59.1965384295901
2010-07-01	58.1993906969740
2010-10-01	59.2199466217377
2011-01-01	60.3158185737497
2011-04-01	60.7098618456525
2011-07-01	60.0035102393380
2011-10-01	61.4513112331618
2012-01-01	61.3273545049407
2012-04-01	62.3491838165149
2012-07-01	62.0058999629341
2012-10-01	61.6859076169433
2013-01-01	63.1728759684950
2013-04-01	64.0710543326287
2013-07-01	63.0629308149469
2013-10-01	62.7852806999300
2014-01-01	63.1254727505255
2014-04-01	65.0498795285134
2014-07-01	64.0290361756177
2014-10-01	64.2652525539222
2015-01-01	65.1911859503737
2015-04-01	65.6258025286120
2015-07-01	66.7226198002063
2015-10-01	67.4180894308723
2016-01-01	67.6663167690188
2016-04-01	68.5061899130422
2016-07-01	67.4738609480852
2016-10-01	68.0356193419983
2017-01-01	66.9523558115002
2017-04-01	67.9607371338392
2017-07-01	68.0791844357618
2017-10-01	69.1197492743359
2018-01-01	69.1719661280336
2018-04-01	69.1666360080281