Period	Persons
1967-01-01	22941477
1972-01-01	24785830
1977-01-01	26889764
1982-01-01	28989069
1987-01-01	31254574
1992-01-01	33520803
1997-01-01	35690778
2002-01-01	37627545
2007-01-01	39331357
2012-01-01	41086927