Year	Thousands of Persons
1990-01-01	25.8
1991-01-01	25.3
1992-01-01	26.7
1993-01-01	28.0
1994-01-01	29.2
1995-01-01	29.8
1996-01-01	29.1
1997-01-01	28.3
1998-01-01	28.6
1999-01-01	29.0
2000-01-01	29.6
2001-01-01	29.9
2002-01-01	31.8
2003-01-01	32.4
2004-01-01	32.6
2005-01-01	32.7
2006-01-01	31.6
2007-01-01	29.1
2008-01-01	26.5
2009-01-01	23.6
2010-01-01	21.6
2011-01-01	20.4
2012-01-01	19.4
2013-01-01	18.8
2014-01-01	17.8
2015-01-01	17.5
2016-01-01	17.3
2017-01-01	16.6