Period	Persons
1967-01-01	9719951
1972-01-01	11478612
1977-01-01	13669054
1982-01-01	15990376
1987-01-01	18275997
1992-01-01	20691641
1997-01-01	23020184
2002-01-01	25333622
2007-01-01	27655937
2012-01-01	29954782