Year	Number
2004-01-01	6792223
2005-01-01	8918324
2006-01-01	10160074
2007-01-01	10378431
2008-01-01	10920143
2009-01-01	10063882
2010-01-01	8881605
2011-01-01	8357670
2012-01-01	7366749
2013-01-01	6677960
2014-01-01	6366240
2015-01-01	6414908
2016-01-01	6250735
2017-01-01	5970929