Year	Number
2004-01-01	5
2005-01-01	5
2006-01-01	5
2007-01-01	8
2008-01-01	13
2009-01-01	29
2010-01-01	32
2011-01-01	40
2012-01-01	51
2013-01-01	58
2014-01-01	63
2015-01-01	66