Period	Persons
1967-01-01	33798820
1972-01-01	37945429
1977-01-01	42093668
1982-01-01	46991385
1987-01-01	52776850
1992-01-01	58370712
1997-01-01	63094069
2002-01-01	68302914
2007-01-01	74229577
2012-01-01	80721874