Year	Number
2004-01-01	21
2005-01-01	34
2006-01-01	43
2007-01-01	87
2008-01-01	174
2009-01-01	315
2010-01-01	280
2011-01-01	460
2012-01-01	610
2013-01-01	818
2014-01-01	998
2015-01-01	1236
2016-01-01	1300
2017-01-01	1413