Year	Number
2004-01-01	36
2005-01-01	34
2006-01-01	31
2007-01-01	30
2008-01-01	29
2009-01-01	28
2010-01-01	26
2011-01-01	25
2012-01-01	23
2013-01-01	20
2014-01-01	19
2015-01-01	18
2016-01-01	18