Period	Persons
1967-01-01	18388
1972-01-01	22340
1977-01-01	27470
1982-01-01	33334
1987-01-01	42148
1992-01-01	49382
1997-01-01	51697
2002-01-01	52161
2007-01-01	52150
2012-01-01	52555