Year	Number
2006-01-01	36
2007-01-01	37
2008-01-01	37
2009-01-01	36
2010-01-01	36
2011-01-01	38
2012-01-01	41
2013-01-01	38
2014-01-01	42
2015-01-01	32
2016-01-01	33