Year	Number
2006-01-01	34
2007-01-01	34
2008-01-01	34
2009-01-01	33
2010-01-01	35
2011-01-01	33
2012-01-01	29
2013-01-01	27
2014-01-01	24
2015-01-01	25
2016-01-01	24