Year	Number
2004-01-01	1063
2005-01-01	1601
2006-01-01	2231
2007-01-01	4053
2008-01-01	4734
2009-01-01	9139
2010-01-01	9108
2011-01-01	10297
2012-01-01	18389
2013-01-01	7043
2014-01-01	9166
2015-01-01	15064
2016-01-01	18906