Year	Number
2004-01-01	590
2005-01-01	560
2006-01-01	428
2007-01-01	427
2008-01-01	419
2009-01-01	404
2010-01-01	408
2011-01-01	397
2012-01-01	386
2013-01-01	378
2014-01-01	361
2015-01-01	352
2016-01-01	344
2017-01-01	342