Year	Number
2004-01-01	0
2005-01-01	3
2006-01-01	3
2007-01-01	3
2008-01-01	3
2009-01-01	4
2010-01-01	5
2011-01-01	11
2012-01-01	24
2013-01-01	24
2014-01-01	25
2015-01-01	28
2016-01-01	28
2017-01-01	40