Year	Number
2004-01-01	880
2005-01-01	2361
2006-01-01	3388
2007-01-01	3590
2008-01-01	4083
2009-01-01	4921
2010-01-01	4949
2011-01-01	5853
2012-01-01	16147
2013-01-01	507
2014-01-01	498
2015-01-01	497
2016-01-01	549
2017-01-01	953