Year	Number
2007-01-01	3678066
2008-01-01	5005999
2009-01-01	6978831
2010-01-01	9278873
2011-01-01	11217021
2012-01-01	27866836
2013-01-01	29443801
2014-01-01	32295700
2015-01-01	33694725
2016-01-01	51657741
2017-01-01	55227519