Year	Number
2004-01-01	21
2005-01-01	75
2006-01-01	81
2007-01-01	88
2008-01-01	67
2009-01-01	69
2010-01-01	80
2011-01-01	131
2012-01-01	45
2013-01-01	53
2014-01-01	56
2015-01-01	151
2016-01-01	156