Quarter	Persons, Seasonally Adjusted
1998-04-01	672200
1999-04-01	664900
2000-04-01	682700
2001-04-01	649100
2002-04-01	639000
2003-04-01	638900
2004-04-01	650400
2005-04-01	646500
2006-04-01	639900
2007-04-01	636400
2008-04-01	602000
2009-04-01	595300
2010-01-01	646200
2010-04-01	657600
2010-07-01	640400
2010-10-01	650100
2011-01-01	628500
2011-04-01	633900
2011-07-01	630600
2011-10-01	614600
2012-01-01	620800
2012-04-01	626200
2012-07-01	609300
2012-10-01	625300
2013-01-01	616600
2013-04-01	619700
2013-07-01	615000
2013-10-01	611200
2014-01-01	612000
2014-04-01	601400
2014-07-01	598100
2014-10-01	565600
2015-01-01	587700
2015-04-01	593700
2015-07-01	587000
2015-10-01	566000
2016-01-01	547300
2016-04-01	576000
2016-07-01	574700
2016-10-01	557500
2017-01-01	564100
2017-04-01	587600
2017-07-01	570000
2017-10-01	562800
2018-01-01	561400
2018-04-01	574100