Year	Number
2004-01-01	35
2005-01-01	37
2006-01-01	41
2007-01-01	45
2008-01-01	48
2009-01-01	46
2010-01-01	45
2011-01-01	45
2012-01-01	44
2013-01-01	46
2014-01-01	49
2015-01-01	45
2016-01-01	47