Year	Number
2005-01-01	1
2006-01-01	5
2007-01-01	6
2008-01-01	6
2009-01-01	6
2010-01-01	4
2011-01-01	4
2012-01-01	4
2013-01-01	4
2014-01-01	4
2015-01-01	4