Year Persons 2005-01-01 18210325 2006-01-01 18537500 2007-01-01 18679200 2008-01-01 18718950 2009-01-01 18797625 2010-01-01 18537475 2011-01-01 18768625 2012-01-01 18794000 2013-01-01 19003400 2014-01-01 19108525 2015-01-01 19191225 2016-01-01 19532825 2017-01-01 19589700