Year	Number
2006-01-01	29692
2007-01-01	23261
2008-01-01	28080
2009-01-01	37675
2010-01-01	59087
2011-01-01	87615
2012-01-01	129464
2013-01-01	253292
2014-01-01	389364
2015-01-01	509590