Year Persons 2005-01-01 16208650 2006-01-01 16632625 2007-01-01 17018800 2008-01-01 17271150 2009-01-01 17406975 2010-01-01 17317950 2011-01-01 17707850 2012-01-01 17808575 2013-01-01 18056125 2014-01-01 18209950 2015-01-01 18367750 2016-01-01 18789700 2017-01-01 18929425