Year	Number
2004-01-01	42
2005-01-01	42
2006-01-01	46
2007-01-01	46
2008-01-01	46
2009-01-01	45
2010-01-01	45
2011-01-01	47
2012-01-01	49
2013-01-01	49
2014-01-01	49
2015-01-01	49
2016-01-01	53