Year	Number
2004-01-01	3
2005-01-01	8
2006-01-01	8
2007-01-01	8
2008-01-01	8
2009-01-01	8
2010-01-01	8
2011-01-01	21
2012-01-01	24
2013-01-01	29
2014-01-01	31
2015-01-01	32
2016-01-01	32
2017-01-01	34