Year	Number
2006-01-01	33
2007-01-01	46
2008-01-01	45
2009-01-01	37
2010-01-01	27
2011-01-01	20
2012-01-01	19
2013-01-01	19
2014-01-01	18
2015-01-01	18
2016-01-01	18