Year	Number
2004-01-01	9
2005-01-01	9
2006-01-01	9
2007-01-01	9
2008-01-01	9
2009-01-01	9
2010-01-01	10
2011-01-01	11
2012-01-01	14
2013-01-01	16
2014-01-01	16
2015-01-01	16