Quarter	Persons, Seasonally Adjusted
2005-01-01	19115000
2005-04-01	19163000
2005-07-01	19202000
2005-10-01	19224000
2006-01-01	19138000
2006-04-01	19184000
2006-07-01	19165000
2006-10-01	19251000
2007-01-01	19273000
2007-04-01	19169000
2007-07-01	19173000
2007-10-01	19231000
2008-01-01	19144000
2008-04-01	19091000
2008-07-01	18836000
2008-10-01	18659000
2009-01-01	18422000
2009-04-01	18166000
2009-07-01	17836000
2009-10-01	17601000
2010-01-01	17542000
2010-04-01	17349000
2010-07-01	17416000
2010-10-01	17283000
2011-01-01	17260000
2011-04-01	17277000
2011-07-01	17248000
2011-10-01	17240000
2012-01-01	17290000
2012-04-01	17352000
2012-07-01	17389000
2012-10-01	17327000
2013-01-01	17383000
2013-04-01	17424000
2013-07-01	17559000
2013-10-01	17604000
2014-01-01	17545000
2014-04-01	17712000
2014-07-01	17676000
2014-10-01	17739000
2015-01-01	17742000
2015-04-01	17810000
2015-07-01	17846000
2015-10-01	17980000
2016-01-01	18080000
2016-04-01	17978000
2016-07-01	18182000
2016-10-01	18087000
2017-01-01	18245000
2017-04-01	18202000