Year	Number
2004-01-01	63
2005-01-01	63
2006-01-01	60
2007-01-01	59
2008-01-01	55
2009-01-01	52
2010-01-01	49
2011-01-01	47
2012-01-01	48
2013-01-01	47
2014-01-01	45
2015-01-01	46
2016-01-01	45