Quarter	Persons, Seasonally Adjusted
1998-04-01	667000
1999-04-01	654800
2000-04-01	665900
2001-04-01	698200
2002-04-01	665100
2003-04-01	634400
2004-04-01	624100
2005-04-01	626800
2006-04-01	635400
2007-04-01	646900
2008-04-01	644200
2009-04-01	643100
2010-01-01	617900
2010-04-01	621600
2010-07-01	630400
2010-10-01	623700
2011-01-01	617600
2011-04-01	618300
2011-07-01	648900
2011-10-01	630000
2012-01-01	616600
2012-04-01	607700
2012-07-01	614300
2012-10-01	621400
2013-01-01	615900
2013-04-01	625000
2013-07-01	625200
2013-10-01	640700
2014-01-01	620500
2014-04-01	635500
2014-07-01	631000
2014-10-01	628200
2015-01-01	622300
2015-04-01	621600
2015-07-01	603000
2015-10-01	619900
2016-01-01	633100
2016-04-01	621000
2016-07-01	607500
2016-10-01	620600
2017-01-01	615100
2017-04-01	622500
2017-07-01	626400
2017-10-01	606700
2018-01-01	616800
2018-04-01	621300