Year	Number
2004-01-01	44
2005-01-01	44
2006-01-01	44
2007-01-01	45
2008-01-01	45
2009-01-01	43
2010-01-01	40
2011-01-01	40
2012-01-01	39
2013-01-01	36
2014-01-01	29
2015-01-01	29
2016-01-01	29