Year	Number
2004-01-01	0
2005-01-01	0
2006-01-01	0
2007-01-01	0
2008-01-01	0
2009-01-01	0
2010-01-01	0
2011-01-01	0
2012-01-01	0
2013-01-01	15
2014-01-01	683
2015-01-01	23523
2016-01-01	55247