Year	Thousands of Persons
1970-01-01	20746
1971-01-01	19606
1972-01-01	19943
1973-01-01	21054
1974-01-01	21025
1975-01-01	19457
1976-01-01	20261
1977-01-01	20889
1978-01-01	21784
1979-01-01	22459
1980-01-01	21942
1981-01-01	21817
1982-01-01	20286
1983-01-01	18511
1984-01-01	19442
1985-01-01	19387
1986-01-01	19492
1987-01-01	19497
1988-01-01	19857
1989-01-01	20197
1990-01-01	19917
1991-01-01	19241
1992-01-01	18855
1993-01-01	18510
1994-01-01	18954
1995-01-01	19300
1996-01-01	19355
1997-01-01	19669
1998-01-01	19686
1999-01-01	19128
2000-01-01	19644
2001-01-01	18434
2002-01-01	17233
2003-01-01	16902
2004-01-01	16484
2005-01-01	16253
2006-01-01	16377
2007-01-01	16302
2008-01-01	15904
2009-01-01	14202
2010-01-01	14081
2011-01-01	14336
2012-01-01	14686