Period	Persons
1967-01-01	4591238
1972-01-01	5747633
1977-01-01	7237015
1982-01-01	9004637
1987-01-01	10928719
1992-01-01	12950995
1997-01-01	15042149
2002-01-01	16674987
2007-01-01	17949061
2012-01-01	19839750