Year Persons 2005-01-01 23039625 2006-01-01 22591000 2007-01-01 22401425 2008-01-01 22271275 2009-01-01 21987875 2010-01-01 21165275 2011-01-01 20335250 2012-01-01 20187275 2013-01-01 19786425 2014-01-01 19539375 2015-01-01 19536525 2016-01-01 19180100 2017-01-01 18942850