Period	Persons
1967-01-01	12455366
1972-01-01	13540301
1977-01-01	14428967
1982-01-01	15244929
1987-01-01	16013030
1992-01-01	16439095
1997-01-01	15333703
2002-01-01	14858948
2007-01-01	15484192
2012-01-01	16791425