Quarter	Persons
2005-01-01	17065136
2005-10-01	17617275
2006-01-01	17106290
2006-07-01	17739133
2007-01-01	17759065
2007-07-01	18790808
2008-01-01	18444038
2008-07-01	19259995
2009-01-01	18575071
2009-07-01	19704904
2010-01-01	19290000
2010-07-01	20910000
2011-01-01	20900000
2011-07-01	22580000
2012-01-01	22233000
2012-07-01	24009000
2013-01-01	23480000