Period	Persons
1967-01-01	12133895
1972-01-01	13953601
1977-01-01	16015737
1982-01-01	18203502
1987-01-01	20424055
1992-01-01	22649612
1997-01-01	24789855
2002-01-01	26729909
2007-01-01	28328410
2012-01-01	29987800