Year	Number
2004-01-01	29
2005-01-01	29
2006-01-01	29
2007-01-01	29
2008-01-01	30
2009-01-01	30
2010-01-01	29
2011-01-01	27
2012-01-01	26
2013-01-01	26
2014-01-01	26
2015-01-01	24
2016-01-01	24