Year	Number
2004-01-01	47
2005-01-01	50
2006-01-01	56
2007-01-01	61
2008-01-01	64
2009-01-01	63
2010-01-01	63
2011-01-01	63
2012-01-01	60
2013-01-01	64
2014-01-01	71
2015-01-01	72
2016-01-01	70
2017-01-01	69