Year	Number
2004-01-01	15
2005-01-01	44
2006-01-01	52
2007-01-01	57
2008-01-01	65
2009-01-01	74
2010-01-01	117
2011-01-01	124
2012-01-01	148
2013-01-01	157
2014-01-01	148