Year	Number
2004-01-01	39
2005-01-01	40
2006-01-01	41
2007-01-01	41
2008-01-01	41
2009-01-01	42
2010-01-01	42
2011-01-01	43
2012-01-01	44
2013-01-01	45
2014-01-01	45
2015-01-01	47