Period	Persons
1967-01-01	25218411
1972-01-01	28517301
1977-01-01	32130628
1982-01-01	36114948
1987-01-01	40042444
1992-01-01	43422423
1997-01-01	46664455
2002-01-01	49261313
2007-01-01	50828959
2012-01-01	52797319