Year	Number
2004-01-01	54
2005-01-01	56
2006-01-01	57
2007-01-01	56
2008-01-01	68
2009-01-01	59
2010-01-01	67
2011-01-01	66
2012-01-01	64
2013-01-01	63
2014-01-01	61
2015-01-01	61
2016-01-01	50
2017-01-01	49