Year	Number
2004-01-01	6
2005-01-01	8
2006-01-01	8
2007-01-01	14
2008-01-01	27
2009-01-01	34
2010-01-01	41
2011-01-01	43
2012-01-01	53
2013-01-01	57
2014-01-01	57
2015-01-01	67