Year	Number
2005-01-01	21
2006-01-01	25
2007-01-01	34
2008-01-01	38
2009-01-01	38
2010-01-01	44
2011-01-01	47
2012-01-01	52
2013-01-01	55
2014-01-01	54
2015-01-01	59