Year	Number
2004-01-01	317
2005-01-01	317
2006-01-01	317
2007-01-01	320
2008-01-01	322
2009-01-01	324
2010-01-01	362
2011-01-01	371
2012-01-01	371
2013-01-01	364
2014-01-01	355
2015-01-01	339