Year	Number
2004-01-01	8
2005-01-01	9
2006-01-01	12
2007-01-01	15
2008-01-01	31
2009-01-01	36
2010-01-01	33
2011-01-01	57
2012-01-01	59
2013-01-01	72
2014-01-01	48
2015-01-01	48