Year	Number
2004-01-01	8
2005-01-01	9
2006-01-01	10
2007-01-01	11
2008-01-01	12
2009-01-01	13
2010-01-01	15
2011-01-01	16
2012-01-01	20
2013-01-01	21
2014-01-01	26
2015-01-01	31
2016-01-01	37