Year	Number
2004-01-01	2
2005-01-01	2
2006-01-01	3
2007-01-01	15
2008-01-01	27
2009-01-01	38
2010-01-01	49
2011-01-01	62
2012-01-01	62
2013-01-01	67
2014-01-01	70
2015-01-01	69
2016-01-01	81