Period	Persons
1967-01-01	5589
1972-01-01	5924
1977-01-01	6886
1982-01-01	8245
1987-01-01	10224
1992-01-01	12970
1997-01-01	16527
2002-01-01	21740
2007-01-01	28638
2012-01-01	32427