Year	Number
2004-01-01	9
2005-01-01	13
2006-01-01	14
2007-01-01	12
2008-01-01	12
2009-01-01	14
2010-01-01	14
2011-01-01	14
2012-01-01	21
2013-01-01	23
2014-01-01	29
2015-01-01	35
2016-01-01	37