Period	Persons
1967-01-01	4057818
1972-01-01	4664739
1977-01-01	5363565
1982-01-01	6167768
1987-01-01	7093264
1992-01-01	8270248
1997-01-01	9849621
2002-01-01	11817297
2007-01-01	14197289
2012-01-01	17157042