Year	Number
2004-01-01	0
2005-01-01	0
2006-01-01	0
2007-01-01	0
2008-01-01	0
2009-01-01	0
2010-01-01	0
2011-01-01	0
2012-01-01	2835
2013-01-01	2468
2014-01-01	4281
2015-01-01	5247
2016-01-01	5385