Year	Thousands of Persons
1990-01-01	20.2
1991-01-01	18.7
1992-01-01	19.2
1993-01-01	19.2
1994-01-01	19.3
1995-01-01	20.2
1996-01-01	20.4
1997-01-01	19.1
1998-01-01	18.8
1999-01-01	17.7
2000-01-01	17.6
2001-01-01	16.0
2002-01-01	14.2
2003-01-01	13.4
2004-01-01	13.1
2005-01-01	13.0
2006-01-01	12.3
2007-01-01	12.1
2008-01-01	11.4
2009-01-01	11.5
2010-01-01	11.8
2011-01-01	11.7
2012-01-01	11.3
2013-01-01	11.5
2014-01-01	11.6
2015-01-01	11.3
2016-01-01	11.5
2017-01-01	11.7