Year	Number
2004-01-01	2574
2005-01-01	4806
2006-01-01	7357
2007-01-01	10347
2008-01-01	11909
2009-01-01	14454
2010-01-01	14459
2011-01-01	25125
2012-01-01	13599
2013-01-01	14556
2014-01-01	14716
2015-01-01	15851
2016-01-01	18772