Year	Number
2004-01-01	4617
2005-01-01	4293
2006-01-01	4623
2007-01-01	4436
2008-01-01	4838
2009-01-01	4505
2010-01-01	3537
2011-01-01	2936
2012-01-01	3188
2013-01-01	1540
2014-01-01	984
2015-01-01	913
2016-01-01	835