Year	Number
2004-01-01	43
2005-01-01	50
2006-01-01	52
2007-01-01	49
2008-01-01	43
2009-01-01	43
2010-01-01	42
2011-01-01	40
2012-01-01	39
2013-01-01	37
2014-01-01	40
2015-01-01	39
2016-01-01	38