Period	Persons
1967-01-01	11703000
1972-01-01	12861000
1977-01-01	13942000
1982-01-01	15196000
1987-01-01	16373000
1992-01-01	17426000
1997-01-01	18568000
2002-01-01	18921000
2007-01-01	20039000
2012-01-01	20328000