Year	Number
2004-01-01	24
2005-01-01	24
2006-01-01	29
2007-01-01	36
2008-01-01	38
2009-01-01	40
2010-01-01	43
2011-01-01	44
2012-01-01	39
2013-01-01	38
2014-01-01	40
2015-01-01	40
2016-01-01	39