Year	Number
2004-01-01	71
2005-01-01	77
2006-01-01	80
2007-01-01	80
2008-01-01	92
2009-01-01	93
2010-01-01	52
2011-01-01	49
2012-01-01	48
2013-01-01	47
2014-01-01	47
2015-01-01	43
2016-01-01	43
2017-01-01	46