Period	Persons
1967-01-01	5783454
1972-01-01	6290197
1977-01-01	7088585
1982-01-01	8557021
1987-01-01	10409987
1992-01-01	13040955
1997-01-01	16088019
2002-01-01	18551068
2007-01-01	21182162
2012-01-01	23852409