Year	Number
2004-01-01	989
2005-01-01	1292
2006-01-01	1255
2007-01-01	1428
2008-01-01	2112
2009-01-01	2671
2010-01-01	3406
2011-01-01	4957
2012-01-01	6075
2013-01-01	18162
2014-01-01	20743
2015-01-01	264630
2016-01-01	93647
2017-01-01	28027