Period	Persons
1967-01-01	23297
1972-01-01	24052
1977-01-01	25809
1982-01-01	27629
1987-01-01	29169
1992-01-01	29864
1997-01-01	31242
2002-01-01	32653
2007-01-01	35013
2012-01-01	37579