Year	Number
2004-01-01	39
2005-01-01	42
2006-01-01	45
2007-01-01	54
2008-01-01	55
2009-01-01	51
2010-01-01	42
2011-01-01	31
2012-01-01	23
2013-01-01	17
2014-01-01	13
2015-01-01	12
2016-01-01	9