Year	Number
2004-01-01	38
2005-01-01	39
2006-01-01	37
2007-01-01	44
2008-01-01	47
2009-01-01	47
2010-01-01	47
2011-01-01	47
2012-01-01	47
2013-01-01	49
2014-01-01	49
2015-01-01	45
2016-01-01	46