Year	Number
2004-01-01	23
2005-01-01	24
2006-01-01	20
2007-01-01	27
2008-01-01	34
2009-01-01	33
2010-01-01	35
2011-01-01	31
2012-01-01	46
2013-01-01	43
2014-01-01	36
2015-01-01	36
2016-01-01	34
2017-01-01	40