Year	Thousands of Persons
1990-01-01	8.7
1991-01-01	9.0
1992-01-01	9.2
1993-01-01	9.5
1994-01-01	9.7
1995-01-01	10.5
1996-01-01	11.3
1997-01-01	12.2
1998-01-01	12.5
1999-01-01	13.4
2000-01-01	14.3
2001-01-01	14.7
2002-01-01	13.7
2003-01-01	14.0
2004-01-01	14.6
2005-01-01	15.0
2006-01-01	15.1
2007-01-01	15.4
2008-01-01	15.9
2009-01-01	15.9
2010-01-01	16.3
2011-01-01	16.8
2012-01-01	17.5
2013-01-01	17.8
2014-01-01	18.3
2015-01-01	18.5
2016-01-01	18.7
2017-01-01	18.7