Year	Number
2004-01-01	53
2005-01-01	44
2006-01-01	40
2007-01-01	40
2008-01-01	38
2009-01-01	38
2010-01-01	38
2011-01-01	38
2012-01-01	39
2013-01-01	39
2014-01-01	39
2015-01-01	38