Year	Number
2004-01-01	8412
2005-01-01	7934
2006-01-01	9144
2007-01-01	7475
2008-01-01	13386
2009-01-01	12479
2010-01-01	11299
2011-01-01	15465
2012-01-01	14845
2013-01-01	13496
2014-01-01	13180
2015-01-01	12390
2016-01-01	11805