Year	Number
2005-01-01	18
2006-01-01	16
2007-01-01	14
2008-01-01	14
2009-01-01	14
2010-01-01	9
2011-01-01	6
2012-01-01	5
2013-01-01	5
2014-01-01	5
2015-01-01	5