Year	Number
2004-01-01	67
2005-01-01	65
2006-01-01	63
2007-01-01	64
2008-01-01	69
2009-01-01	68
2010-01-01	64
2011-01-01	60
2012-01-01	59
2013-01-01	59
2014-01-01	58
2015-01-01	57
2016-01-01	53
2017-01-01	51