Year	Number
2004-01-01	41
2005-01-01	40
2006-01-01	44
2007-01-01	46
2008-01-01	51
2009-01-01	385
2010-01-01	396
2011-01-01	386
2012-01-01	384
2013-01-01	374
2014-01-01	358
2015-01-01	370
2016-01-01	373
2017-01-01	399