Year	Number
2004-01-01	18615
2005-01-01	32517
2006-01-01	70837
2007-01-01	147077
2008-01-01	253309
2009-01-01	461289
2010-01-01	774682
2011-01-01	1356723
2012-01-01	1941667
2013-01-01	2990734
2014-01-01	3367084
2015-01-01	4171277
2016-01-01	5151920