Period	Persons
1967-01-01	5033
1972-01-01	5756
1977-01-01	6778
1982-01-01	8670
1987-01-01	21628
1992-01-01	32892
1997-01-01	31304
2002-01-01	27450
2007-01-01	28905
2012-01-01	30959