Year	Number
2004-01-01	39
2005-01-01	42
2006-01-01	45
2007-01-01	54
2008-01-01	55
2009-01-01	53
2010-01-01	44
2011-01-01	33
2012-01-01	25
2013-01-01	19
2014-01-01	15
2015-01-01	14
2016-01-01	11