Year	Number
2004-01-01	57
2005-01-01	54
2006-01-01	54
2007-01-01	54
2008-01-01	61
2009-01-01	62
2010-01-01	62
2011-01-01	62
2012-01-01	61
2013-01-01	62
2014-01-01	58
2015-01-01	56
2016-01-01	53