Year	Number
2004-01-01	13
2005-01-01	13
2006-01-01	13
2007-01-01	14
2008-01-01	22
2009-01-01	27
2010-01-01	31
2011-01-01	36
2012-01-01	35
2013-01-01	50
2014-01-01	61
2015-01-01	65
2016-01-01	69
2017-01-01	70