Year	Number
2007-01-01	1
2008-01-01	1
2009-01-01	3
2010-01-01	8
2011-01-01	11
2012-01-01	18
2013-01-01	25
2014-01-01	29
2015-01-01	34
2016-01-01	24
2017-01-01	27