Year	Number
2004-01-01	4
2005-01-01	4
2006-01-01	5
2007-01-01	5
2008-01-01	6
2009-01-01	12
2010-01-01	16
2011-01-01	18
2012-01-01	24
2013-01-01	31
2014-01-01	43
2015-01-01	53
2016-01-01	62