Year	Thousands of Persons
1990-01-01	3.6
1991-01-01	3.7
1992-01-01	3.7
1993-01-01	4.2
1994-01-01	4.2
1995-01-01	3.9
1996-01-01	2.5
1997-01-01	3.4
1998-01-01	3.8
1999-01-01	3.9
2000-01-01	4.1
2001-01-01	4.0
2002-01-01	3.7
2003-01-01	3.9
2004-01-01	4.1
2005-01-01	4.0
2006-01-01	4.0
2007-01-01	4.1
2008-01-01	4.0
2009-01-01	3.5
2010-01-01	3.5
2011-01-01	3.6
2012-01-01	3.5
2013-01-01	3.5
2014-01-01	3.5
2015-01-01	3.6
2016-01-01	3.6
2017-01-01	3.4