Year	Number
2004-01-01	63
2005-01-01	62
2006-01-01	62
2007-01-01	59
2008-01-01	58
2009-01-01	58
2010-01-01	59
2011-01-01	57
2012-01-01	56
2013-01-01	55
2014-01-01	52
2015-01-01	50
2016-01-01	38
2017-01-01	37