Year	Thousands of Persons
2003-01-01	18.7
2004-01-01	19.3
2005-01-01	19.3
2006-01-01	18.8
2007-01-01	18.9
2008-01-01	19.1
2009-01-01	19.3
2010-01-01	19.1
2011-01-01	18.5
2012-01-01	18.3
2013-01-01	18.2
2014-01-01	17.8
2015-01-01	17.3
2016-01-01	17.1
2017-01-01	16.8