Year	Number
2004-01-01	40
2005-01-01	40
2006-01-01	40
2007-01-01	40
2008-01-01	40
2009-01-01	40
2010-01-01	41
2011-01-01	42
2012-01-01	51
2013-01-01	51
2014-01-01	51
2015-01-01	51