Period	Persons
1967-01-01	19669838
1972-01-01	22404289
1977-01-01	25134640
1982-01-01	28173493
1987-01-01	31362479
1992-01-01	34608171
1997-01-01	37901358
2002-01-01	41216304
2007-01-01	44498390
2012-01-01	47704427