Year	Number
2004-01-01	49
2005-01-01	48
2006-01-01	48
2007-01-01	48
2008-01-01	48
2009-01-01	48
2010-01-01	47
2011-01-01	47
2012-01-01	47
2013-01-01	56
2014-01-01	56
2015-01-01	56
2016-01-01	57