Period	Persons
1967-01-01	276633994
1972-01-01	285163956
1977-01-01	292463324
1982-01-01	298160968
1987-01-01	301234732
1992-01-01	307703324
1997-01-01	312445578
2002-01-01	318369329
2007-01-01	327996772