Year	Number
2004-01-01	2
2005-01-01	2
2006-01-01	2
2007-01-01	10
2008-01-01	15
2009-01-01	20
2010-01-01	42
2011-01-01	72
2012-01-01	41
2013-01-01	107
2014-01-01	123
2015-01-01	152
2016-01-01	188