Year	Number
2004-01-01	4
2005-01-01	12
2006-01-01	13
2007-01-01	17
2008-01-01	24
2009-01-01	30
2010-01-01	42
2011-01-01	57
2012-01-01	71
2013-01-01	89
2014-01-01	114
2015-01-01	144
2016-01-01	160