Year	Number
2004-01-01	29
2005-01-01	28
2006-01-01	28
2007-01-01	29
2008-01-01	29
2009-01-01	28
2010-01-01	28
2011-01-01	28
2012-01-01	28
2013-01-01	28
2014-01-01	28