Year	Thousands of Persons
1990-01-01	15.8
1991-01-01	15.7
1992-01-01	15.8
1993-01-01	16.2
1994-01-01	16.1
1995-01-01	16.1
1996-01-01	16.5
1997-01-01	17.6
1998-01-01	18.4
1999-01-01	18.6
2000-01-01	17.9
2001-01-01	18.3
2002-01-01	18.5
2003-01-01	19.4
2004-01-01	20.4
2005-01-01	21.7
2006-01-01	21.3
2007-01-01	20.3
2008-01-01	20.0
2009-01-01	18.9
2010-01-01	17.8
2011-01-01	16.8
2012-01-01	16.8
2013-01-01	15.8
2014-01-01	15.0
2015-01-01	14.0
2016-01-01	13.2
2017-01-01	13.2