Year Persons 2003-01-01 17700 2004-01-01 17825 2005-01-01 17625 2006-01-01 17950 2007-01-01 18575 2008-01-01 19175 2009-01-01 19525 2010-01-01 19925 2011-01-01 19925 2012-01-01 19525 2013-01-01 19575 2014-01-01 19875 2015-01-01 19675 2016-01-01 18850 2017-01-01 19000