Year	Thousands of Persons
1990-01-01	14.7
1991-01-01	15.1
1992-01-01	15.7
1993-01-01	16.1
1994-01-01	16.4
1995-01-01	17.8
1996-01-01	18.5
1997-01-01	18.9
1998-01-01	19.6
1999-01-01	19.9
2000-01-01	19.8
2001-01-01	19.6
2002-01-01	20.6
2003-01-01	23.1
2004-01-01	24.6
2005-01-01	24.8
2006-01-01	22.5
2007-01-01	21.8
2008-01-01	20.8
2009-01-01	19.2
2010-01-01	18.4
2011-01-01	17.6
2012-01-01	17.8
2013-01-01	17.9
2014-01-01	18.0
2015-01-01	17.6
2016-01-01	17.5
2017-01-01	17.7