Year	Thousands of Persons
1990-01-01	25.6
1991-01-01	25.2
1992-01-01	25.8
1993-01-01	25.6
1994-01-01	25.9
1995-01-01	27.0
1996-01-01	28.5
1997-01-01	29.2
1998-01-01	29.7
1999-01-01	31.2
2000-01-01	32.6
2001-01-01	32.6
2002-01-01	31.8
2003-01-01	32.9
2004-01-01	33.5
2005-01-01	34.1
2006-01-01	33.4
2007-01-01	33.6
2008-01-01	33.6
2009-01-01	33.0
2010-01-01	32.4
2011-01-01	31.7
2012-01-01	31.5
2013-01-01	31.4
2014-01-01	30.8
2015-01-01	30.0
2016-01-01	29.5
2017-01-01	28.9