Year	Number
2004-01-01	11
2005-01-01	12
2006-01-01	12
2007-01-01	12
2008-01-01	19
2009-01-01	24
2010-01-01	28
2011-01-01	32
2012-01-01	11
2013-01-01	29
2014-01-01	32
2015-01-01	33