Period	Persons
1967-01-01	8057629
1972-01-01	9083737
1977-01-01	10190202
1982-01-01	11488683
1987-01-01	13480997
1992-01-01	15471695
1997-01-01	17568461
2002-01-01	19786307
2007-01-01	22525659
2012-01-01	25366462