Year	Number
2004-01-01	72
2005-01-01	70
2006-01-01	68
2007-01-01	69
2008-01-01	67
2009-01-01	66
2010-01-01	65
2011-01-01	62
2012-01-01	59
2013-01-01	58
2014-01-01	59
2015-01-01	61
2016-01-01	62