Year	Thousands of Persons
1990-01-01	4.1
1991-01-01	4.1
1992-01-01	3.8
1993-01-01	4.6
1994-01-01	3.5
1995-01-01	3.3
1996-01-01	3.3
1997-01-01	3.4
1998-01-01	3.6
1999-01-01	3.3
2000-01-01	2.9
2001-01-01	3.3
2002-01-01	3.3
2003-01-01	3.2
2004-01-01	3.5
2005-01-01	3.4
2006-01-01	3.5
2007-01-01	3.4
2008-01-01	3.4
2009-01-01	3.4
2010-01-01	3.4
2011-01-01	3.6
2012-01-01	3.4
2013-01-01	3.4
2014-01-01	3.3
2015-01-01	3.3
2016-01-01	3.4
2017-01-01	3.2