Year Persons 2005-01-01 12700 2006-01-01 9700 2007-01-01 9200 2008-01-01 8900 2009-01-01 11100 2010-01-01 12875 2011-01-01 12800 2012-01-01 12600 2013-01-01 13050 2014-01-01 13475 2015-01-01 18000 2016-01-01 18050 2017-01-01 18425