Year	Number
2004-01-01	45
2005-01-01	43
2006-01-01	37
2007-01-01	47
2008-01-01	58
2009-01-01	59
2010-01-01	61
2011-01-01	59
2012-01-01	74
2013-01-01	71
2014-01-01	61
2015-01-01	60
2016-01-01	57
2017-01-01	61