Year	Thousands of Persons
1970-01-01	17880
1971-01-01	18140
1972-01-01	18290
1973-01-01	19210
1974-01-01	19020
1975-01-01	18370
1976-01-01	18520
1977-01-01	18510
1978-01-01	18550
1979-01-01	18740
1980-01-01	19180
1981-01-01	19300
1982-01-01	19210
1983-01-01	19470
1984-01-01	19630
1985-01-01	19820
1986-01-01	19760
1987-01-01	19560
1988-01-01	20120
1989-01-01	20600
1990-01-01	20890
1991-01-01	21510
1992-01-01	21850
1993-01-01	21670
1994-01-01	21490
1995-01-01	21160
1996-01-01	21130
1997-01-01	21260
1998-01-01	20410
1999-01-01	19990
2000-01-01	19710
2001-01-01	19120
2002-01-01	18170
2003-01-01	17800
2004-01-01	17310
2005-01-01	17050
2006-01-01	17190
2007-01-01	17210
2008-01-01	16880
2009-01-01	16020
2010-01-01	15620
2011-01-01	15490
2012-01-01	15330