Year	Number
2004-01-01	26
2005-01-01	25
2006-01-01	21
2007-01-01	23
2008-01-01	25
2009-01-01	26
2010-01-01	39
2011-01-01	40
2012-01-01	40
2013-01-01	44
2014-01-01	44