Period	Persons
1967-01-01	20707258
1972-01-01	23126276
1977-01-01	25805575
1982-01-01	28971839
1987-01-01	32933081
1992-01-01	36690739
1997-01-01	40926063
2002-01-01	45808736
2007-01-01	48910248
2012-01-01	52274945