Year	Number
2004-01-01	39
2005-01-01	36
2006-01-01	35
2007-01-01	35
2008-01-01	36
2009-01-01	36
2010-01-01	33
2011-01-01	32
2012-01-01	31
2013-01-01	30
2014-01-01	28
2015-01-01	28
2016-01-01	27