Period	Persons
1967-01-01	8947399
1972-01-01	10599846
1977-01-01	12461337
1982-01-01	14435914
1987-01-01	16301879
1992-01-01	18547047
1997-01-01	21693597
2002-01-01	25238267
2007-01-01	28740630
2012-01-01	32578209