Period	Persons
1967-01-01	32448404
1972-01-01	36475356
1977-01-01	41020211
1982-01-01	45997940
1987-01-01	51168270
1992-01-01	55815175
1997-01-01	60372413
2002-01-01	65022300
2007-01-01	69496513
2012-01-01	73997128