Year	Number
2004-01-01	17
2005-01-01	17
2006-01-01	17
2007-01-01	18
2008-01-01	35
2009-01-01	38
2010-01-01	42
2011-01-01	44
2012-01-01	52
2013-01-01	55
2014-01-01	68
2015-01-01	81
2016-01-01	82
2017-01-01	64