Year	Number
2004-01-01	33
2005-01-01	34
2006-01-01	35
2007-01-01	35
2008-01-01	36
2009-01-01	36
2010-01-01	37
2011-01-01	43
2012-01-01	43
2013-01-01	42
2014-01-01	42
2015-01-01	50
2016-01-01	46