Year	Number
2004-01-01	151
2005-01-01	171
2006-01-01	171
2007-01-01	171
2008-01-01	318
2009-01-01	363
2010-01-01	807
2011-01-01	905
2012-01-01	1417
2013-01-01	1733
2014-01-01	1870
2015-01-01	2345
2016-01-01	4954