Year	Number
2004-01-01	9069
2005-01-01	8604
2006-01-01	9729
2007-01-01	11065
2008-01-01	18798
2009-01-01	17567
2010-01-01	16160
2011-01-01	15978
2012-01-01	15314
2013-01-01	13886
2014-01-01	13507
2015-01-01	12669
2016-01-01	12041