Period	Persons
1967-01-01	9299545
1972-01-01	10918137
1977-01-01	12958110
1982-01-01	15469003
1987-01-01	18139966
1992-01-01	21771781
1997-01-01	25903704
2002-01-01	29186427
2007-01-01	33218250
2012-01-01	37195349