Period	Persons
1967-01-01	8846984
1972-01-01	9882718
1977-01-01	11213159
1982-01-01	12729259
1987-01-01	13374618
1992-01-01	14350459
1997-01-01	16914628
2002-01-01	19319894
2007-01-01	22171404
2012-01-01	25203395