Quarter	Persons, Seasonally Adjusted
1998-04-01	639500
1999-04-01	622100
2000-04-01	636400
2001-04-01	666600
2002-04-01	630000
2003-04-01	600400
2004-04-01	589700
2005-04-01	591000
2006-04-01	602100
2007-04-01	618200
2008-04-01	602300
2009-04-01	606300
2010-01-01	578200
2010-04-01	581100
2010-07-01	593300
2010-10-01	586600
2011-01-01	575200
2011-04-01	574400
2011-07-01	605900
2011-10-01	590200
2012-01-01	574100
2012-04-01	564700
2012-07-01	570800
2012-10-01	579600
2013-01-01	571200
2013-04-01	582300
2013-07-01	584900
2013-10-01	596300
2014-01-01	577200
2014-04-01	594200
2014-07-01	588300
2014-10-01	582400
2015-01-01	577300
2015-04-01	577400
2015-07-01	559100
2015-10-01	571300
2016-01-01	584600
2016-04-01	575700
2016-07-01	561700
2016-10-01	576000
2017-01-01	570900
2017-04-01	579600
2017-07-01	585200
2017-10-01	566300
2018-01-01	576600
2018-04-01	580800