Year	Thousands of Persons
1990-01-01	4.4
1991-01-01	3.9
1992-01-01	3.8
1993-01-01	3.9
1994-01-01	3.9
1995-01-01	3.9
1996-01-01	4.1
1997-01-01	4.1
1998-01-01	3.9
1999-01-01	3.9
2000-01-01	4.0
2001-01-01	3.7
2002-01-01	3.8
2003-01-01	3.8
2004-01-01	3.9
2005-01-01	3.7
2006-01-01	3.6
2007-01-01	3.5
2008-01-01	3.3
2009-01-01	3.0
2010-01-01	2.9
2011-01-01	2.8
2012-01-01	2.6
2013-01-01	2.7
2014-01-01	2.5
2015-01-01	2.1
2016-01-01	2.0
2017-01-01	1.9