Year	Number
2004-01-01	5850
2005-01-01	6800
2006-01-01	7512
2007-01-01	8525
2008-01-01	9255
2009-01-01	9497
2010-01-01	10037
2011-01-01	11161
2012-01-01	14079
2013-01-01	17910
2014-01-01	14024
2015-01-01	15809