Year	Number
2004-01-01	2557893
2005-01-01	180173
2007-01-01	18050352
2008-01-01	21094862
2009-01-01	21704015
2010-01-01	22467338
2011-01-01	24236668
2012-01-01	25323484
2013-01-01	26137609
2014-01-01	27429733
2015-01-01	27890009
2016-01-01	28799727