Year	Number
2004-01-01	9161
2005-01-01	15499
2006-01-01	8111
2007-01-01	7755
2008-01-01	7241
2009-01-01	7366
2010-01-01	7292
2011-01-01	6673
2012-01-01	4492
2013-01-01	8664
2014-01-01	7006
2015-01-01	10973