Year	Thousands of Persons
1990-01-01	18.5
1991-01-01	19.5
1992-01-01	19.4
1993-01-01	19.0
1994-01-01	19.4
1995-01-01	19.8
1996-01-01	20.5
1997-01-01	22.0
1998-01-01	23.0
1999-01-01	24.7
2000-01-01	26.6
2001-01-01	27.1
2002-01-01	27.8
2003-01-01	27.7
2004-01-01	28.3
2005-01-01	29.0
2006-01-01	29.4
2007-01-01	30.0
2008-01-01	30.5
2009-01-01	30.1
2010-01-01	30.4
2011-01-01	31.1
2012-01-01	31.9
2013-01-01	32.9
2014-01-01	33.2
2015-01-01	33.2
2016-01-01	31.9
2017-01-01	30.5