Year	Number
2006-01-01	21
2007-01-01	13
2008-01-01	13
2009-01-01	12
2010-01-01	13
2011-01-01	13
2012-01-01	13
2013-01-01	13
2014-01-01	13
2015-01-01	13
2016-01-01	12