Year	Number
2004-01-01	1
2005-01-01	3
2006-01-01	5
2007-01-01	7
2008-01-01	15
2009-01-01	20
2010-01-01	19
2011-01-01	27
2012-01-01	28
2013-01-01	27
2014-01-01	23
2015-01-01	22
2016-01-01	26