Year Persons 2005-01-01 19200725 2006-01-01 19046100 2007-01-01 18930325 2008-01-01 18802600 2009-01-01 18655800 2010-01-01 18283100 2011-01-01 18081025 2012-01-01 17879575 2013-01-01 17703575 2014-01-01 17664975 2015-01-01 17515900 2016-01-01 17463825 2017-01-01 17413925