Period	Persons
1967-01-01	18378189
1972-01-01	21121467
1977-01-01	24238011
1982-01-01	27767775
1987-01-01	31740965
1992-01-01	37731020
1997-01-01	44078397
2002-01-01	49516960
2007-01-01	57187942
2012-01-01	65705093