Year	Number
2004-01-01	14
2005-01-01	15
2006-01-01	15
2007-01-01	17
2008-01-01	24
2009-01-01	27
2010-01-01	29
2011-01-01	28
2012-01-01	32
2013-01-01	35
2014-01-01	36
2015-01-01	36