Year	Number
2004-01-01	6
2005-01-01	6
2006-01-01	6
2007-01-01	14
2008-01-01	24
2009-01-01	29
2010-01-01	35
2011-01-01	36
2012-01-01	38
2013-01-01	40
2014-01-01	40
2015-01-01	40
2016-01-01	40