Year	Number
2004-01-01	41
2005-01-01	41
2007-01-01	71
2008-01-01	71
2009-01-01	81
2010-01-01	86
2011-01-01	89
2012-01-01	89
2013-01-01	89
2014-01-01	89
2015-01-01	89