Year	Number
2004-01-01	4709
2005-01-01	5570
2006-01-01	5941
2007-01-01	7182
2008-01-01	7756
2009-01-01	7984
2010-01-01	8887
2011-01-01	9147
2012-01-01	10565
2013-01-01	14475
2014-01-01	16057
2015-01-01	15119
2016-01-01	15857