Quarter	Persons, Seasonally Adjusted
2007-01-01	17400
2007-04-01	17700
2007-07-01	16600
2007-10-01	17400
2008-01-01	15300
2008-04-01	16500
2008-07-01	16400
2008-10-01	17800
2009-01-01	17700
2009-04-01	16900
2009-07-01	17100
2009-10-01	16900
2010-01-01	18100
2010-04-01	16700
2010-07-01	18200
2010-10-01	17400
2011-01-01	18200
2011-04-01	18100
2011-07-01	17200
2011-10-01	19500
2012-01-01	18300
2012-04-01	18100
2012-07-01	17100
2012-10-01	19000
2013-01-01	19900
2013-04-01	16800
2013-07-01	18800
2013-10-01	19600
2014-01-01	18100
2014-04-01	18900
2014-07-01	18200
2014-10-01	19200
2015-01-01	19300
2015-04-01	20400
2015-07-01	21600
2015-10-01	20100
2016-01-01	20700
2016-04-01	21900
2016-07-01	22000
2016-10-01	21100
2017-01-01	22300
2017-04-01	22200
2017-07-01	21800
2017-10-01	21500
2018-01-01	22600
2018-04-01	22500