Period	Persons
1967-01-01	13221828
1972-01-01	15214618
1977-01-01	16758831
1982-01-01	17899241
1987-01-01	19334557
1992-01-01	20838090
1997-01-01	22240833
2002-01-01	23248059
2007-01-01	24111989
2012-01-01	24763188