Period	Persons
1967-01-01	8518
1972-01-01	10137
1977-01-01	13840
1982-01-01	17357
1987-01-01	21343
1992-01-01	27402
1997-01-01	35596
2002-01-01	44742
2007-01-01	51472
2012-01-01	57570