Year	Thousands of Persons
1990-01-01	16.4
1991-01-01	16.6
1992-01-01	17.2
1993-01-01	17.4
1994-01-01	17.4
1995-01-01	17.1
1996-01-01	17.8
1997-01-01	18.4
1998-01-01	18.3
1999-01-01	19.0
2000-01-01	19.4
2001-01-01	18.7
2002-01-01	17.3
2003-01-01	16.7
2004-01-01	17.2
2005-01-01	17.4
2006-01-01	16.7
2007-01-01	16.6
2008-01-01	16.1
2009-01-01	14.7
2010-01-01	14.1
2011-01-01	14.2
2012-01-01	14.3
2013-01-01	14.3
2014-01-01	14.6
2015-01-01	14.6
2016-01-01	15.4
2017-01-01	15.2