Year	Number
2004-01-01	66
2005-01-01	59
2006-01-01	55
2007-01-01	56
2008-01-01	56
2009-01-01	54
2010-01-01	54
2011-01-01	49
2012-01-01	49
2013-01-01	46
2014-01-01	46
2015-01-01	46
2016-01-01	46
2017-01-01	43