Quarter	Persons, Seasonally Adjusted
2005-01-01	20653000
2005-04-01	20720000
2005-07-01	20820000
2005-10-01	21007000
2006-01-01	21117000
2006-04-01	21158000
2006-07-01	21126000
2006-10-01	21191000
2007-01-01	21283000
2007-04-01	21075000
2007-07-01	20927000
2007-10-01	20959000
2008-01-01	20839000
2008-04-01	20778000
2008-07-01	20535000
2008-10-01	20091000
2009-01-01	19306000
2009-04-01	18938000
2009-07-01	18511000
2009-10-01	18030000
2010-01-01	18021000
2010-04-01	18194000
2010-07-01	18275000
2010-10-01	18285000
2011-01-01	18491000
2011-04-01	18475000
2011-07-01	18431000
2011-10-01	18587000
2012-01-01	18395000
2012-04-01	18512000
2012-07-01	18500000
2012-10-01	18591000
2013-01-01	18496000
2013-04-01	18455000
2013-07-01	18570000
2013-10-01	18517000
2014-01-01	18524000
2014-04-01	18685000
2014-07-01	18855000
2014-10-01	18982000
2015-01-01	18980000
2015-04-01	18824000
2015-07-01	18863000
2015-10-01	19026000
2016-01-01	19259000
2016-04-01	19261000
2016-07-01	19174000
2016-10-01	19395000
2017-01-01	19452000
2017-04-01	19590000