Year	Number
2005-01-01	4
2006-01-01	4
2007-01-01	5
2008-01-01	14
2009-01-01	17
2010-01-01	21
2011-01-01	21
2012-01-01	8
2013-01-01	27
2014-01-01	34
2015-01-01	41