Period	Persons
1967-01-01	8580647
1972-01-01	9988441
1977-01-01	11470628
1982-01-01	13324390
1987-01-01	15736176
1992-01-01	18788440
1997-01-01	22084527
2002-01-01	25943441
2007-01-01	30728747
2012-01-01	36345860