Year	Number
2004-01-01	2
2005-01-01	2
2006-01-01	2
2007-01-01	2
2008-01-01	3
2009-01-01	13
2010-01-01	25
2011-01-01	35
2012-01-01	50
2013-01-01	81
2014-01-01	81
2015-01-01	74