Year	Number
2004-01-01	25
2005-01-01	29
2006-01-01	32
2007-01-01	33
2008-01-01	39
2009-01-01	39
2010-01-01	40
2011-01-01	41
2012-01-01	43
2013-01-01	43
2014-01-01	43
2015-01-01	43
2016-01-01	43