Year	Number
2004-01-01	17
2005-01-01	21
2006-01-01	27
2007-01-01	27
2008-01-01	30
2009-01-01	30
2010-01-01	30
2011-01-01	31
2012-01-01	30
2013-01-01	69
2014-01-01	68
2015-01-01	70