Year	Number
2004-01-01	331
2005-01-01	216
2006-01-01	174
2007-01-01	270
2008-01-01	596
2009-01-01	817
2010-01-01	1866
2011-01-01	956
2012-01-01	1515
2013-01-01	2165
2014-01-01	2484
2015-01-01	3325
2016-01-01	15864
2017-01-01	15052