Period	Persons
1967-01-01	11081
1972-01-01	11853
1977-01-01	12225
1982-01-01	12667
1987-01-01	14237
1992-01-01	15894
1997-01-01	18123
2002-01-01	19575
2007-01-01	20118
2012-01-01	20754