Year	Number
2004-01-01	4596782
2005-01-01	5583065
2006-01-01	6520820
2007-01-01	7350448
2008-01-01	6770459
2009-01-01	7732945
2010-01-01	4360662
2011-01-01	3597888
2012-01-01	3557170
2013-01-01	4539654
2014-01-01	3691828
2015-01-01	3601152
2016-01-01	1644138
2017-01-01	1867031