Period	Persons
1967-01-01	19691
1972-01-01	22153
1977-01-01	24444
1982-01-01	26514
1987-01-01	27797
1992-01-01	29512
1997-01-01	31758
2002-01-01	33821
2007-01-01	35308
2012-01-01	36656