Year	Number
2004-01-01	47
2005-01-01	52
2006-01-01	57
2007-01-01	61
2008-01-01	61
2009-01-01	61
2010-01-01	61
2011-01-01	58
2012-01-01	59
2013-01-01	59
2014-01-01	56
2015-01-01	55
2016-01-01	54