Period	Persons
1967-01-01	30130983
1972-01-01	33505406
1977-01-01	36411795
1982-01-01	39326352
1987-01-01	41621690
1992-01-01	43747962
1997-01-01	45953580
2002-01-01	47622179
2007-01-01	48597652
2012-01-01	50004441