Year	Number
2007-01-01	1325
2008-01-01	1870
2009-01-01	1074
2010-01-01	2858
2011-01-01	4632
2012-01-01	5113
2013-01-01	4352
2014-01-01	6
2015-01-01	11
2016-01-01	55
2017-01-01	37